How things work

If light slows down passing through water, how does it speed back up when it comes out?

Human Biology

What are the different blood types, and why can't we mix them?

Science and Technology

How does a computer unset a bit (set it from 1 to 0) in memory/storage?

Science and Technology

How do motion detectors detect motion in the dark?

Planet Earth

How do we know what materials the interior of the Earth is made of if the farthest we have dug is 8 miles?

How things work

Why are canned foods high in sodium? Doesn't canning eliminate the need for preservatives?

Science and Technology

How do baggage scanners at the airport work? What do the different colors on the x-ray mean?

How things work

Why is CO2 added to carbonated water/soda and not other gasses? Why not add just air?

Science and Technology

What is the difference between noise isolating and noise cancelling headphones?

Science and Technology

How is it possible for ISP's to know we are doing online? Isn't HTTPS supposed encrypt content so it can't be read?

How things work

How can a piece of paper folded 103 times be larger than the observable universe?

Science and Technology

Why do voices sound high pitched when sped up?

Human Biology

What are the negative effects of drugs like Ecstasy or Molly?

Planet Earth

Why Are Fungi Considered Neither Plant Nor Animal?

World

What makes a melody sound happy or sad?