Science Capsules

GPS accuracy depends on precise clock synchronization between satellites and receivers, and that synchronization requires Einstein’s relativity. Readers will understand how satellite motion, gravitational effects, orbital shape, and Earth’s rotation influence GPS timing, and why correcting for these effects is essential to the location accuracy used every day.

Ice sheets, ocean currents, and cloud physics could shift Earth's climate faster than the smooth curves in most projections. The findings diverge on how close those tipping points are, how much to trust the models that predict them, and how finance and policy should price risks that arrive suddenly rather than gradually. What you take from them shapes how urgent, and how hedged, you think climate decisions need to be.