The uptick came after sightings plummeted by 43% following the FAA flight restrictions imposed on Dec. 18, Kim said. On that same day, Enigma received nearly 50 sightings. A week later ...

Boom is convinced it can overcome the barriers that grounded the Concorde and make supersonic travel affordable and greener.

Take this test to see how optimistic you are. Using the key below, answer the questions based on how often the statement applies to you.

How well do you focus? The ability to focus on tasks will serve you well at work and in relationships, while a short attention span may be a sign of a condition such as ADHD. Take this quiz to ...