A laser is usually constructed from two basic elements: a material that provides optical gain through stimulated emission and an optical cavity that partially traps the light. When the total gain in ...

At least 44 people have been killed after a fire engulfed several buildings at a high-rise residential complex in Hong Kong. Hong Kong leader John Lee said another 279 people were reported missing, ...

Big Apple coed Amelia Lewis said she was walking down Broadway shortly before 9:30 a.m. on Monday when a violent vagrant came up behind her and attacked her without warning. “As I’m walking, like with ...

There is so much to see in the night sky tonight, here's what you can look forward to. A lovely 21%-illuminated waxing crescent moon will be visible on Christmas Eve, shining in the southwest after ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Investopedia / Madelyn Goodnight Block policies provide all-risk coverage for goods in ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Want to see the visible planets in the night sky? The Celestron NexStar 4SE is ideal for ...

C21 Subscription and C21Insight subscribers. You can access this subscription story - and hundreds more like them every month - for as little as £17/month. This premium content is only accessible with ...

H&R Block's e-filing products are intuitive and easy to use. For paid users, tax pro support is available via screen share or chat. Many, or all, of the products featured on this page are from our ...

It's Christmas Eve and we are going to go celebrate being young and being alive.