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Celebrations that include loud fireworks often terrify dogs. Though there's not yet much science to confirm it, some veterinarians and pet owners say CBD, an extract of hemp or marijuana, can ease a pet's fear. Francisco Goncalves/Getty hide caption

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Francisco Goncalves/Getty

An artist's rendering of a black hole that's 2 billion times more massive than our sun. Streams of particles ejected from black holes like this one are thought to be the brightest objects in the universe. ESO/M. Kornmesser hide caption

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ESO/M. Kornmesser

Some Bizarre Black Holes Put On Light Shows

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Fireworks explode over the National Mall during the 2015 July 4 fireworks show in Washington, D.C. For its 2016 Independence Day show, PBS used stock footage from previous shows, due to bad weather in the capital. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

A multi-vehicle crash reportedly killed one person and set off explosions in a truck carrying fireworks on I-94 west of Battle Creek, Mich., Friday. Mark Bugnaski/MLIVE.COM /Landov hide caption

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Mark Bugnaski/MLIVE.COM /Landov

At least 28 people were injured Thursday in Simi Valley, Calif., when many of the fireworks at a July 4th celebration ignited too close to the ground. People there caught the accident and posted videos. YouTube.com hide caption

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YouTube.com

Oops. A "premature ignition" in San Diego sent an entire fireworks show off at once. YouTube.com hide caption

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YouTube.com

KABOOM! San Diego's Entire Fireworks Show Ignites At Once

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