A prototype of a reusable cotton swab designed by a trio of Danish entrepreneurs. (Courtesy of LastSwab) At a Glance Danish entrepreneurs have designed a reusable cotton swab.More than 1.5 billion cotton swabs are used each day.The swabs are another example of polluting single use plastics. A trio of Danish entrepreneurs have designed a reusable cotton swab in an effort to help eliminate single-use plastic. While the idea of a reusable cotton bud for your ears may seem revolting to...

A sign prohibiting entry to a site in Britain due to the presence of Japanese knotweed. The invasive plant has reached emergency proportions there. (Clive Gee/PA Images via Getty Images) At a Glance The plant was first introduced to the U.S. in the 1800s.It has no known predator and is extremely difficult to eradicate.In Britain, banks refuse to approve mortgages on property where knotweed is present. A killer is stalking the U.S., terrorizing victims as it makes its way from...

Decades after invasive species, raccoon attacks and disease wiped out the local population, Yosemite National Park is once again home to the delicate frogs. ...