AASHO Road Test axle weight fourth power road damage

Heavier vehicle axles can cause far more road damage

Road tests in the late 1950s found that damage increased roughly with the fourth power of axle weight. Under this rule, doubling the weight on an axle could cause about 16 times as much road damage.

Southeast Asian coral reefs support millions of fishers

3.35 million fishers

About 3.35 million fishers rely on Southeast Asia’s coral reefs. Warming beyond 1.5 °C poses a severe threat to tropical coral reefs, putting ecosystems that support these fisheries at increasing risk.

Black-hole winds can create stars or stop them from forming

Winds from matter falling toward a black hole can squeeze nearby gas and help new stars form. Stronger winds can instead blow much of a galaxy's gas away, leaving less material for new stars. The same kind of black-hole activity can therefore either help or stop star formation.

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AASHO Road Test axle weight fourth power road damage

Heavier vehicle axles can cause far more road damage

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