Disclaimer: There may be spoilers ahead. The 2020s have been a decade marked by numerous challenges, many of which have cast a shadow over recent years. One of the decade’s most significant events — ...

It’s hard to know when you're least likely to become pregnant. Having sex when you think it’s a "safe" time (called fertility awareness) can lead to an unplanned pregnancy. Pregnancy is most likely to ...

Throughout its long history, Earth has warmed and cooled time and again. Climate has changed when the planet received more or less sunlight due to subtle shifts in its orbit, as the atmosphere or ...