Clouds are more than fluffy shapes in the sky; they tell us what’s happening in the atmosphere. Scientists classify different types of clouds based on their height, shape, and whether they bring fair weather or severe weather. Learn more: https://pulse.ly/zqpp6gg1gc | Howstuffworks

HowStuffWorks honors the historic Apollo 11 mission 50 years after its astronauts became the first humans to ever step foot on the moon. | Howstuffworks

5.5K views · 13 reactions | Since the program began in 1970, more than 7,500 witnesses and more than 9,500 witness family members have entered it and been protected, relocated, and given new identities by the U.S. Marshals Service. Learn how WITSEC works here: https://people.howstuffworks.com/witness-protection.htm?utm_source=facebook | Howstuffworks | Facebook