An infectious disease doctor explains the science behind COVID-19 vaccines at a level that children – and adults – of all ages can understand.
Aug. 30, 2021 • ~8 min
Planting a massive number of trees can help slow climate change, but it is only part of the solution.
Aug. 23, 2021 • ~6 min
Consuming alcohol makes accidents more likely and it can harm your heart, your liver and even change your brain. But making the sale of beer, wine and hard liquor illegal flopped.
Aug. 9, 2021 • ~6 min
The Earth is constantly changing in natural ways, but most of those changes are very slow. Humans are speeding up other changes with global warming.
Aug. 2, 2021 • ~6 min
Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.
July 26, 2021 • ~5 min
Billions of galaxies are in the universe, with billions of stars in every galaxy. Could billions of planets be out there too?
July 19, 2021 • ~7 min