Readers Respond to the June 2025 Issue

BUBBLE SPEED In “The Quantum Bubble That Could Destroy the Universe,” Matthew von Hippel discusses vacuum decay, in which a change in the Higgs field would create an expanding quantum bubble that would transform the laws of physics within it. He describes an essay proposing that “humanity could survive vacuumContinue Reading

How to spend a perfect day in Helsinki

This article was produced by National Geographic Traveller (UK). Finnish people living in Helsinki — a capital set at 60 degrees north, on a peninsula surrounded by Baltic waters — don’t simply brave the elements. Instead, they revel in cold plunges, rejoice in the warmth of cedar-lined saunas and takeContinue Reading

15 baby rabbits born at an NYC zoo released in New England

Release of rabbits in Fort Foster Park in Kittery, Maine. Image: US Fish & Wildlife Service. Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday. The grey-brown New England cottontail (Sylvilagus transitionalis)—New England’s only native rabbit—once thrived throughout the northeastern United States. In recent decades,Continue Reading