Crucially, the answer is the same for everyone each day, meaning that you're competing against the rest of the world, rather ...

For over a decade, mathematicians have failed to agree whether a 500-page proof is actually correct. Now, translating the ...

Dozens of unsheltered people in Santa Rita Park did their best Tuesday to seek refuge from the sun on a day Tucson's temperatures peaked at 87 degrees. They huddled under trees, tents, umbrellas and ...