Champlain Towers South, a 12-story condominium in Surfside, Florida has collapsed.

Many residents of the 130+ impacted units are feared dead or trapped.

The building was determined to be unstable a year ago.

A visual investigation of the collapse: usatoday.com/in-depth/graph… The collapse left piles of debris around the building and coated cars two blocks away with dust.

Here's a video of the event that appears to be captured by a surveillance camera on a nearby building:

https://twitter.com/AndySlater/status/1408051917964595202

In a year upended by COVID-19, our immune systems have received more attention than ever before.

But many unhealthy behaviors brought on by the pandemic make it harder for our bodies to fight off infections.

How to maintain a balanced immune system: usatoday.com/in-depth/graph… When working to improve your immune system function, the first line of defense is a healthy lifestyle.

Unhealthy eating, sleep deprivation, lack of exercise, and stress can put you at risk: usatoday.com/in-depth/graph…

The federal safety inspectors who protect kids from dangerous and deadly toys were not standing guard for nearly six months while this year’s holiday gifts entered the U.S. by the shipload: usatoday.com/story/news/inv… Princess palaces and playhouses, water guns and tricycles landed on store shelves and front doorsteps without the usual security checks for lead, chemicals or choking hazards: usatoday.com/story/news/inv…

"See that Thanksgiving celebrations are restricted as much as possible so as to prevent another flare-up."

-Omaha World Herald, Nov. 28, 1918.

Over century ago, Americans lived under quarantines and face mask orders. Millions mourned loved ones: usatoday.com/in-depth/news/… And health officials in many cities issued the same holiday warning that we hear today: Stay home and stay safe.

By November 1918, the US – in the midst of the suffrage movement, Jim Crow and WWI – battled the second wave of the H1N1 influenza epidemic also known as Spanish Flu.

Scientific evidence has shown that a face mask protects the wearer from COVID-19, not only those around them.

But with so many choices, what's your best option? A recent study is designed to help make the right call: usatoday.com/in-depth/news/… Using lasers, a box, and a camera, scientists devised a way to test how effectively different masks block coronavirus particles.

The study's authors caution that more analysis is needed, and that the results are not meant to be generalized.

That said, N95 masks came out on top.

COVID-19 cases in the U.S. surged past China and Italy last week as more tests became available throughout the country.

Here's what to expect if you are tested for coronavirus: usatoday.com/in-depth/news/… If you think you have been exposed to COVID‑19 and develop a fever and symptoms, such as cough or difficulty breathing, the CDC wants you to call your health care provider for medical guidance.

Coronavirus can survive in the air for hours, and on common materials for days. This is how long it can last on various surfaces, and what you need to know to protect yourself: usatoday.com/in-depth/news/… According to the New England Journal of Medicine, airborne droplets containing the virus can stay aloft for up to three hours. Droplets can stay suspended long enough for someone to walk through and inhale the virus. Outdoors, wind disperses the virus.

Attorney General William Barr kept details of the Mueller report secret for nearly a month following his March 24 letter to Congress. Here are the original quotations from his letter combined with the full context provided by the report: