ScienceNow: The harder you push a sled across a frozen pond, the faster it accelerates. In 1687, Isaac Newton quantified this most basic bit of physics with his second law, which states that the force applied to an object equals its mass times its acceleration (F=ma). Now scientists have verified this law with unprecedented precision, challenging critics who have suggested the rule somehow bends for very small accelerations.
The finding that the Saturnian moon may host layers of icy slush instead of a global ocean could change how planetary scientists think about other icy moons as well.
Modeling the shapes of tree branches, neurons, and blood vessels is a thorny problem, but researchers have just discovered that much of the math has already been done.
January 29, 2026 12:52 PM
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