Gloomy, cloudy days and the transition from summer to winter are dreaded by many for the same reason: shorter days with less sunlight. Internal body clocks known as circadian rhythms help us adjust our sleep and wakefulness accordingly, but for some, the disruption might lead to a type of depression called Seasonal Affective Disorder.

This family of peregrine falcons is taking advantage of urban Chicago's resources.

With a maximum speed of 75 mph and an onboard camera, "the prey drone" excels at filming the peregrine falcon.

Apollo astronauts and engineers tell the inside story of Apollo 8, the first manned mission to the moon. The U.S. space program suffered a bitter setback when Apollo 1 ended in a deadly fire during a pre-launch run-through. In disarray, and threatened by the prospect of a Soviet Union victory in the space race, NASA decided upon a radical and risky change of plan.

Research on the biology of political beliefs provides insight into the effectiveness of how to win any argument. Current theories suggest that people’s political beliefs are driven by their identification with a group—similar to sports team loyalties, but more rooted in values, which makes them harder to change. Processing political thoughts may be a simple question of "Us versus Them."

See the world through the eyes of nature’s fastest animal: the peregrine falcon. Though once perilously endangered in the U.S., this spectacular predator is now thriving again in American cities and on every continent but Antarctica. What is the secret to its predatory prowess? Join expert falconer Lloyd Buck as he trains a captive peregrine and puts its hunting skills to the test.

In 1944, three WWII airmen disappeared beneath the waves. Can a team of forensic archaeologists and medical examiners identify them?

Dive to the bottom of the Adriatic Sea in search of the Tulsamerican, a B-24 bomber that crashed off the coast of Croatia during World War II. In 2010, divers located the plane. Now the Department of Defense, aided by the Croatian Navy and some of the world’s leading underwater archaeologists, sets to work investigating the wreckage.

Named for the Alabama town in which they trained, the Tuskegee Airmen had to "fight just to fly." Capt. Dickson, whose plane went down in the mountains between Italy and Austria during his 68th mission, is one of 27 Tuskegee airmen missing since WWII. Can DNA analysis identify him?

NOVA takes you inside the historic international race to develop the first supersonic airliner, the Concorde. Hear stories from those inside the choreographed effort to design and build Concorde in two countries at once—and the crew members who flew her. Then, follow Concorde’s legacy to a new generation of innovators reviving the dream of supersonic passenger travel today.

Antonio Paris translates how to survive on other planets into surviving after Maria.

The spinning of the Earth means we don't always see straight paths as straight.

After Hurricane Maria, the Arecibo Observatory and its staff worked to rebuild its facility––home to the most powerful astronomical radar and one of the largest radio telescopes on Earth––and aid the neighboring community.

Ben Francis became addicted to opioid painkillers in high school after a soccer injury. Today, he helps others struggling with addiction through an opiate epidemic task force.

In her teens, Casey stayed busy with sports. But severe muscle cramps landed her in the hospital, where she was prescribed opioids for her pain. An emergency room doctor realized she was addicted and said not to come back—leaving her and her family to deal with the problem on their own.

Supervised injection sites—like the one in Vancouver, Canada—offer people a safer place to use, often helping those with a long history of addiction who don’t respond to oral treatments like methadone and Suboxone.

Therapist Cindy Chamberlin works with children at high risk of physical and developmental delays, through an innovative program called Birth to Three. Its goal is to intervene early to help children develop the skills they need.

Hear firsthand from individuals struggling with addiction and follow the cutting-edge work of doctors and scientists as they investigate why addiction is not a moral failing, but a chronic, treatable medical condition. Easy access to drugs like heroin, fentanyl, and even prescription medications like OxyContin has fueled an epidemic of addiction—the deadliest in U.S. history.

Nearly 20 million Americans are struggling with addiction, yet over 90% of them will not receive treatment, in large part due to the stigma surrounding the disease. One way to destigmatize addiction is to change the language that we use to describe it, starting now.