Leftover calzones are delicious, but they only taste great if you heat them up correctly. Here's how to make sure they're as tasty as when they were fresh.

Newly discovered Quipu, a superstructure in which galaxies group together in clusters and clusters of clusters, is the ...

Cleaner, more pure water backscatters light in the blue range, which makes it look blue. One famous example is Crater Lake in ...