Aerogels are the Worlds Lightest Solids

Aerogels are the world’s lightest (least dense) solids. They are also excellent thermal insulators and have been used in numerous Mars missions and the Stardust comet particle-return mission. The focus of this video by Veritasium is silica aerogels, though graphene aerogels are now technically the lightest. Original Article : HERE ; The Ultimate Survival Food: The Lost Ways

An FBI Agent On How To Read Body Language

Former FBI agent and body language expert Joe Navarro breaks down the various ways we communicate non-verbally. What does it mean when we fold our arms? Why do we interlace our fingers? Can a poker player actually hide their body language? Video by Wired Original Article : HERE ; The Ultimate Survival Food: The Lost Ways

The Side Effects of Vaccines How High is the Risk?

Vaccines are one of our best tools to prevent dangerous diseases, but they come with side effects. So would it be safer not to vaccinate? For a list of sources Kurzgesagt used in this video, click here. Original Article : HERE ; The Ultimate Survival Food: The Lost Ways

Why Are 96,000,000 Black Balls On This Reservoir?

Veritasium took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they’re there. The first time he heard about shade balls the claim was they reduce evaporation. But it turns out this isn’t the reason they were introduced. The balls are made of high density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. They are 10cm (4 inches) in diameter and contain about 210ml of water. So the main reason they are on the reservoir is to block sunlight from entering the water and triggering a chemical reaction that turns harmless bromide into carcinogenic bromate. This effect occurs …