Dr. Know: How Dirty Are Bathrooms?

Does toilet paper protect your hands from bacteria in the bathroom? Learn more about bathroom hygiene in this video from Discovery.

• More Discovery Health Videos
• 

Does mixing your alcohol really cause a worse hangover? Learn more about the effects of a night of hard drinking in this video from Discovery.

• More Discovery Health Videos
• 

Nanotechnology deals with materials and machines on an incredibly tiny scale. To learn more about nanotechnology, check out this HowStuffWorks video.

• More HowStuffWorks Videos
• 

Watch this video from ScienCentral as the Science Sensei discusses subliminal campaign ads. New research shows that subliminal messages can change political views and behavior.

• More ScienCentral Videos
• 

A simple video game has been shown to reduce stress. As this ScienCentral News video explains, researchers at McGill University also found that playing the game resulted in increased productivity.

• More ScienCentral Videos
• 

Watch this video from the University of Florida showing a new anti-reflective coating that could help reduce eye strain from computer screen glare. UF engineers researched moths since their eyes don't reflect light.

• More University of Florida Videos
• 

Watch this video about "green" sculpting on HowStuffWorks. Sculptors at London's Madame Tussauds waxwork museum used organic ingredients, recycling techniques and carbon off-setting to make a new model of Prince Charles. The figure was handmade by... More »

• More Reuters Videos
• 

Watch this fun music video about prime numbers on HowStuffWorks. This humorous song describes prime numbers and their history. Learn about prime numbers in this NOVA segment from PBS.

• More WGBH NOVA Videos
•