Urban archaeologists dig for stories beneath city streets.

Vaccines work with our immune system to keep us from getting sick.

Vaccination began as a traditional therapy over a thousand years ago.

The polio vaccine's history extends more than fifty years.

Can new technology prevent aircraft like Flight MH370 from disappearing without a trace? Airing October 8 at 9 pm on PBS Please be advised The Boeing Company is a funder of the NOVA series. Please note, however, that no funds from Boeing were applied to this specific episode.

A new global geek squad is harnessing cryptography to stay a step ahead of cybercriminals. Airing September 24, 2014 at 9 pm on PBS

New technology may bypass the need to keep vaccines cold by stabilizing them with silk.

Aquanauts study the health of marine organisms—by becoming their neighbors.

NASA’s Kepler mission lets us search for planets orbiting stars outside our solar system.

Scientists discover evidence for the key ingredients for life on Saturn's moon Enceladus.

Comets carrying chemicals necessary for life may have come to Earth billions of years ago.

Human papillomavirus, or HPV, can cause cervical cancer. Bhutan is the first developing country to welcome the widespread vaccination of girls against HPV, and cervical cancer rates have dropped. Some countries have resisted the vaccine, but in Bhutan even the royal princess is onboard.

The world can be a dangerous place, full of foes large and little. Take deadly infectious diseases. Host David Pogue considers a new kind of vaccine that might save millions of lives, while eliminating the need for refrigeration and scary needles.

Dorothy Roseman describes her close encounters with vaccine-preventable diseases.

Science shows it’s a small world after all—and nature’s networks follow a similar pattern.

Diseases that were largely eradicated in the United States a generation ago—whooping cough, measles, mumps—are returning, in part because nervous parents are skipping their children's shots. NOVA takes viewers around the world to track epidemics, explore the science behind vaccinations, hear from parents wrestling with vaccine-related questions, and shed light on the risks of opting out.

Diseases that were largely eradicated in the United States a generation ago—whooping cough, measles, mumps—are returning, in part because nervous parents are skipping their children's shots. NOVA takes viewers around the world to track epidemics, explore the science behind vaccinations, hear from parents wrestling with vaccine-related questions, and shed light on the risks of opting out.

Three physicists untie a 150-year-old tangle of a puzzle.

A city-wide competition shaped the career of the architect behind Florence’s famous dome.

Did a lethal plague kill thousands in ancient Rome? Centuries-old DNA may hold the answer.