Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

Some days we don’t have enough time, other days we have too much. As a result, we either never get around to the things we really want to do, or we procrastinate. That’s why productivity expert John ...

This meant that the calendar method predicted ovulation correctly in only one in four women, whereas the ClearBlue Digital Ovulation test (20 test pack) predicted correctly in 99% of women over the ...