The Universe in a Grain of Sand – We know roughly how many galaxies there are in the universe, and we determined that number by looking at a patch of sky no bigger than a grain of sand.
Gravity Waves – What is a gravitational wave, and how do we know they exist?
A Biased View – How do we deal with bias in our observational data?
Real Kids. Real Questions. Real Answers. – Most of the time I write about astrophysics, but from time to time I also write about another project I’m working on, Prove Your World.