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PBS News Hour
See the Difference Between Pipe and Pressure Cooker Bombs
In this web exclusive scene, science correspondent Miles O'Brien explains the difference between pipe bombs and pressure cooker bombs, like the ones used at the 2013 Boston Marathon. Pipe bombs are much smaller so the pipe itself is the shrapnel. Less space means more pressure, and their size makes them easier to conceal.
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Tuesday on the NewsHour, President Biden warns a Russian invasion of Ukraine is still possible despite Moscow's claims that it's pulling back some of its troops.
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U.S., European and Russian leaders hold separate high-level talks in ongoing attempts to defuse tensions over Ukraine.
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Justice Breyer's retirement makes way for President Biden to fulfill his campaign promise and nominate the first Black woman to the Supreme Court.
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Monday on the NewsHour, the United States puts thousands of troops on heightened alert as the threat of Russian invasion grows more severe.
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Thursday on the NewsHour, the Supreme court blocks vaccine requirements for large businesses but permits them for most health care workers.
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