Can Cloud Nine be built?

8yr ⋅

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What would it take to build a ship capable of crossing the Pacific?

9yr ⋅

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What were the machines really doing with humans in the Matrix?

9yr ⋅

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A Bird that Never Touches Ground

9yr ⋅

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What is the amputationility of a monomolecular wire weapon?

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What would be the ideal melee weapon for someone with superhuman strength?

9yr ⋅

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Is it possible for a religion with >1 billion followers to die out?

8yr ⋅

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What is the best way to use my two portals?

9yr ⋅

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How could a group of 6 people destroy an army?

10yr ⋅

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Time-traveling Combat

9yr ⋅

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If corners were illegal, where would the ghosts live?

9yr ⋅

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Deep Space bomber - Best bomb against Interstellar warship that is kilometers long in size

7yr ⋅

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How would a moon in geostationary orbit appear to wax and wane?

7yr ⋅

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Could this Very Specific Dragon Fly?

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How would living at a pole affect mapping and navigation?

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Mecha exoskeletons for livestock

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Orienting a pilot inside a space fighter

7yr ⋅

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Encountering the Accountants : Spreading Numeracy in the Neolithic World

7yr ⋅

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Anatomically Correct Sleipnir

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Evolution of ophidian sapience and caudal tool use

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How much would it cost to recreate Doggerland as it existed before 16,000 BC?

9yr ⋅

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What if gravity goes out while man is swimming in a pool on board of a spaceship?

7yr ⋅

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How would multi-race humanoid evolution happen?

9yr ⋅

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How (un)likely is a split of one major river into two others?

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Let's evolve whales and dolphins back onto land

8yr ⋅

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Can you add a mini moon to Earth?

9yr ⋅

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Could Spore's Spice Geysers Exist?

8yr ⋅

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Zombie perpetual motion machines

9yr ⋅

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Cheapest way to fake the Mars landing

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The Reality of a River World

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Could two planets be tidally locked to each other so close they share their atmosphere?

10yr ⋅

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Shooting non-lethal projectiles with long strings attached?

7yr ⋅

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How to create the eternal storm?

8yr ⋅

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Would Elephant Bird Light Cavalry be feasible?

8yr ⋅

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How to let a Whale urh... fly?

8yr ⋅

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Would the inner planets of our Solar System line up?

7yr ⋅

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Silica Aerogel maze

7yr ⋅

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Can you forge a sword using just one piece of metal?

9yr ⋅

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Rocky desert or Sand desert - Which would appear in this scenario?

7yr ⋅

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How would or could a creature with a crystalline sail evolve?

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What would happen if all 433 nuclear reactors had meltdowns?

7yr ⋅

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Rynn's Jewelry Box: Best Way to Use a Unique Small-Scale Replicator?

9yr ⋅

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Why would people use flapping-wing instead of fixed-wing aircraft?

10yr ⋅

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The impacts of the Moon's limited gravity on the design of a Moon city's transportation network

7yr ⋅

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Extending the Kola Superdeep Borehole

7yr ⋅

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Explosion contained in the depths of a crystal: how would it work?

8yr ⋅

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What would be needed to travel through sand?

7yr ⋅

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How would a four or five winged creature, such as a microraptor, fly?

7yr ⋅

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When and how would a Dyson sphere civilization in a fantasy setting learn size and shape of the sphere?

7yr ⋅

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What would people with black eyes see?

8yr ⋅

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What would this nebula look like from a planet?

8yr ⋅

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What would be the effects of galaxies colliding?

9yr ⋅

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How would laser weapons affect combat and military tactics?

7yr ⋅

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Resolving anachronism: Have a modern society with outdated warfare

7yr ⋅

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Where to Anchor My Space Elevator

10yr ⋅

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What are some major architectural designs in spaceships for aquatic beings

9yr ⋅

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How will my nerdy Mars astronauts do battle between their colonies?

9yr ⋅

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Runaway Starship Ramps

8yr ⋅

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How, if at all, would the Wind System be Different in a world of Floating Islands?

8yr ⋅

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Advantages of armour when fighting zombies

9yr ⋅

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What effects could a hole in a planet have?

10yr ⋅

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Micro Marines : Arming the Miniature Army

7yr ⋅

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Which map projection would result in an accurate visual depiction of a mega crater?

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Destroy a Planet inside a black hole?

8yr ⋅

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Realistic Airships

7yr ⋅

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Could a blade of a large grasslike plant stop the fall of an “ant man”?

7yr ⋅

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Brutal, unsubtle brainwashing: how does it work?

9yr ⋅

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What could make a star violet?

7yr ⋅

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What material should be used for a spaceship that doesn't need to re-enter?

7yr ⋅

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Can we identify distinct colors beyond visible light?

8yr ⋅

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Adaptations of a Very Specific Dragon to this Combination of Large Size and Flight

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What is the smallest change I can make to history to allow the French Empire not to fall?

8yr ⋅

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Undetectable exoplanets

7yr ⋅

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Anatomically correct Ent

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What is the caloric requirement of a fire spell?

8yr ⋅

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Conflicting milestones, what to do?

7yr ⋅

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How to construct atmospheric pressure belts for my world?

7yr ⋅

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An unusual crime-and-punishment scenario - is it plausible?

7yr ⋅

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Would it be possible to ride a gravitational wave?

8yr ⋅

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Escaping a pair of orbiting black holes through the saddle

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If our world was on a turtle... then how big would the planet the turtle is living on be?

8yr ⋅

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Mimics and wooden chests: chest-like monsters, or monster-like chests?

8yr ⋅

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Is my space station feasible?

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Anatomically Correct Graboid

8yr ⋅

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Anatomically Correct Argonian

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Anatomically Correct Gnolls

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How wide would my cylinder be to allow air 500m below water surface?

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How could a sentient plant evolve and what conditions would be required for this evolution?

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Anatomically Correct Creeper

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How can I find out the length of seasons and solar year on this planet?

7yr ⋅

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Please help me calculate acceptable planet sizes & eclipse shadows cast by my binary planet system

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Would the rock formations in the giant's causeway scale?

7yr ⋅

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How would long-term exposure to artificial gravity (as generated by a Stanford torus) affect human evolution?

10yr ⋅

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How Might I Design Mountains for My Tidally Locked Planet?

7yr ⋅

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Is an artificial gravity room on a modern spacecraft or space station feasible?

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What are some assumptions we could make about the linguistics of a civilization evolved from birds?

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Would a circumbinary planet have a differently colored sky depending on which star was visible?

8yr ⋅

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How do I blend cultures - naming world features?

10yr ⋅

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Would a 2 thumbed hand increase grip significantly?

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What is the maxiumum depth for an Earth like atmosphere?

9yr ⋅

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Tips for Improving a Fictional Map's Coastlines

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Sky color of an alien world

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Plausible Plasma Weapons

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Get/Keep Air on the Moon!

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How can I account for the curvature of Earth for my straight line (10th Century)?

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The evolution of neon kittens

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How can I get a very large air bubble floating under Europa's ice?

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Making the Enterprise Fly

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Defensive strategies against teleporting dragons

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Earth approached by ugly aliens

9yr ⋅

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Consistency of Giant Spider Webs

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Destruction of the moon

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How long would it take a region to geologically settle down after a major cataclysm?

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What would happen to Earth if the Moon was destroyed?

9yr ⋅

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A predator with pseudo-invisibility, partially achieved by airborne chemicals

7yr ⋅

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Is it practical to wield a bladed weapon in mouth?

8yr ⋅

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Gravitational effects of portals at different heights

10yr ⋅

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Anatomically Correct Huddle

7yr ⋅

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Are portals possible?

10yr ⋅

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