The original version of this story appeared in Quanta Magazine. Hard problems are usually not a welcome sight. But cryptographers love them. That’s because certain hard math problems underpin the ...

Republicans in power have refused to negotiate and Democrats have squared off for a political fight. What neither side has devised is an easy offramp to prevent what ...

When you have played the game, why not put your new skills to the test and download this fun activity sheet?

Only specific groups will continue to be eligible for subsidized vaccines, including people with chronic health conditions, those aged 65 and older, and health-care workers. Moderna’s latest COVID-19 ...

CVS and Walgreens will not be offering COVID-19 vaccines without a prescription in more than a dozen states this fall as new federal guidelines narrow who is eligible for the shots. The two retail ...