Halloween is celebrated on October 31, and is one of the world’s oldest holidays. It has evolved into a celebration enjoyed by all ages, and includes fun activities like trick-or-treating, dressing up in costumes, carving jack-o'-lanterns, going to a bonfire, apple bobbing, visiting a haunted house and telling scary stories.
Did you ever wonder why we sometimes enjoy being scared? Learn about the science of fear , find tips about staying safe and healthy on Halloween, learn about “vampire” appliances , download information on Halloween storms, do research on black cats  or find fun activities to do at home or in school – all of this information (and more) is available for free on Science.gov 
Science.gov is made available to the public by the US Department of Energy’s Office of Scientific and Technical Information (OSTI ). It searches over 50 databases and over 2100 selected websites from 14 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results.
So have a scary, happy and scientific Halloween…boo !!