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Gravity feels like it’s pulling everything toward Earth, but why? AdventurePhoto/E+ via WikimediaCommons

Why does gravity pull us down and not up?

Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.
The sky’s not always the limit. AP Photo/Susan Walsh

Why America has a debt ceiling: 5 questions answered

Sen. Mitch McConnell said Republicans won't vote for an increase in the debt ceiling, which would risk a US default. An economist explains why it's time to get rid of the debt limit once and for all.
Unaccompanied immigrant minors wait for Border Patrol processing after they crossed the Rio Grande into Roma, Texas, April 29, 2021. John Moore/Getty Images

This is what happens to child migrants found alone at the border, from the moment they cross into the US until age 18

A record 95,079 child migrants had arrived alone at the US's southern border by July this year. The US is legally responsible for these children, but it is struggling to give them adequate care.
President Biden and Vice President Harris met on Feb. 12, 2021, with governors and mayors to discuss supporting them in the fight against COVID-19. Pete Marovich-Pool/Getty Images

The Trump administration feuded with state and local leaders over pandemic response – now the Biden administration is trying to turn back a page in history

People can die when the federal government doesn't work well with state and local governments – the COVID-19 crisis showed that. But the Biden administration has signaled an openness to collaboration.

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