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You and nine other individuals have been captured by super-intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they're not sure whether you qualify, so they decide to give you all a test. Can you solve this hat riddle? Alex Gendler shows how.

This is the solution to: http://youtu.be/QD3hbVG1yxM

Bill details the engineering choices underlying the design of a beverage can. He explains why it is cylindrical, outlines the manufacturing steps needed to created the can, notes why the can narrows near it lid, show close ups of the double-seam that hold the lid on, and details the complex operation of the tab that opens the can.

This problem has made the rounds on the internet but I felt it deserved a treatment like this.

How to pack a suitcase. Top tips and life hacks to make packing a suitcase as quick and efficient as possible. Solve common travel problems and learn new packing solutions.

How to cut string or rope if you haven't got a knife or a pair of scissors. Great life hack trick to help you in an emergency. Cut rope with string!

How to fold a shirt under 2 seconds. This step by step guide shows you how to fold a shirt very quickly. Works on all short sleeved tops including t-shirts and polo shirts. Great tutorial and easy to learn.

Imagine a school where playing video games is encouraged during classes and may even replace exams. A new educational programme uses SimCity to test children on vital problem-solving skills.

Can art save lives? Not exactly, but our most prized professionals (doctors, nurses, police officers) can learn real world skills through art analysis. Studying art like Rene Magritte's Time Transfixed can enhance communication and analytical skills, with an emphasis on both the seen and unseen. Amy E. Herman explains why art historical training can prepare you for real world investigation.

Scores of passengers, together with staff at Stirling station, managed to tilt the carriage so the man could free his leg which was wedged in the gap. The man was boarding a Perth-bound train at about 8:50am when he slipped and became stuck.

How do you investigate hypotheses? Do you seek to confirm your theory - looking for white swans? Or do you try to find black swans? I was startled at how hard it was for people to investigate number sets that didn't follow their hypotheses, even when their method wasn't getting them anywhere.

3 Simple Ways to Time Travel (& 3 Complicated Ones)

The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram.