How microlensing can reveal isolated black holes

A black hole can reveal itself by bending a distant star's light

Even a black hole with no bright companion can be found when its gravity bends the light of a background star and changes how bright the star appears. But different objects can produce similar signals, so possible isolated black holes usually need more observations.

Fires weakened the Twin Towers after fireproofing was stripped away

The US National Institute of Standards and Technology concluded that plane impacts removed much of the steel’s fireproofing, and fires then weakened the towers’ structures. The agency said the towers likely would have remained standing if the fireproofing had not been removed.

Georgia replaced its entire traffic police force

~30,000 officers

In 2005, Georgia dismissed about 30,000 officers because of corruption and built a replacement force with new recruits, rather than trying to reform the existing one.

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How microlensing can reveal isolated black holes

A black hole can reveal itself by bending a distant star's light

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