skip to main content

Listen

Read

Watch

Schedules

Programs

Events

Give

Account

Donation Heart Ribbon

NOVA scienceNOW: Leeches; SETI; Stem Cells Breakthrough; Edith Widder

Airs Wednesday, June 22, 2011 at 8 p.m. on KPBS TV

Above: SETI - the search for extraterrestrial intelligence - has just expanded to begin the systematic survey of millions of star systems for signs of advanced civilizations. "NOVA scienceNOW" reports on this impressive new effort, called the Allen Telescope Array (pictured).

Hosted by renowned astrophysicist, author and director of the Hayden Planetarium, Neil deGrasse Tyson, "NOVA scienceNOW" covers four timely science and technology stories per one-hour episode.

"NOVA scienceNOW" host Neil deGrasse Tyson (right) gets up close and personal with macrobdella decora - the North American medicinal leech - with leech expert Mark Siddall of the American Museum of Natural History.
Enlarge this image

Above: "NOVA scienceNOW" host Neil deGrasse Tyson (right) gets up close and personal with macrobdella decora - the North American medicinal leech - with leech expert Mark Siddall of the American Museum of Natural History.

"Leeches" - Leeches, those innocent bloodsuckers, have been bad-mouthed to the point that they've become synonymous with obnoxious freeloaders.

Even host Neil deGrasse Tyson is creeped out while wading through leech-infested waters with scientist Mark Siddall, who runs the leech lab at the American Museum of Natural History. Siddall notes that leeches are far less dangerous than mosquitoes and ticks as disease spreaders. They've recently made something of a comeback, and are today used when reattached fingers and toes become engorged with excess blood that must be drained off.

Leeches are hermaphrodites and exist in countless species and ecological niches throughout nature. You'll gain new respect for these fascinating little creatures and never use their name in vain again.

Video

NOVA scienceNOW: Leeches

Watch the full episode. See more NOVA scienceNOW.

The Parkes Observatory is a radio telescope observatory 20 kilometres north of the town of Parkes, New South Wales, Australia. It is best known as the dish that sent images of the first moon landing to the rest of the world.
Enlarge this image

Above: The Parkes Observatory is a radio telescope observatory 20 kilometres north of the town of Parkes, New South Wales, Australia. It is best known as the dish that sent images of the first moon landing to the rest of the world.

"SETI" - In 1960, a curious astronomer named Frank Drake aimed a radio telescope at a couple of nearby stars and started listening. More than 40 years later, we're still listening, and SETI - the search for extraterrestrial intelligence - has just expanded big-time to begin the systematic survey of millions of star systems for signs of advanced civilizations.

"NOVA scienceNOW" reports on this impressive new effort, called the Allen Telescope Array. The project is underwritten primarily by billionaire philanthropist Paul G. Allen and will eventually comprise 350 giant dish antennas, all working in unison to answer the question: Are we alone?

Video

NOVA scienceNOW: SETI

Watch the full episode. See more NOVA scienceNOW.

The Cloning Process

In this slide show, Harvard stem cell scientists take you through the process of creating embryonic stem cells using a cloned mouse embryo. Scientists generally refer to the technique as "somatic cell nuclear transfer." It is the process at the heart of what is alternately called "therapeutic cloning" or "human cloning."

"Stem Cells Breakthrough" - Researchers around the world are touting a possible new way of creating embryonic-like stem cells - without the embryo. Japanese researchers were the first to discover a way to "turn back the clock" on adult skin cells to create what look like embryonic stem cells - special cells normally found in a growing embryo that have the ability to become any type of cell in the body.

Building on the Japanese discovery, U.S. researchers have since been creating these stem cells from human skin cells, with the hopes of possibly using these cells to understand diseases like diabetes, Alzheimer's and Parkinson's. Though the new method offers a potential alternative to the ethically charged work of using human embryos to isolate these important stem cells, the technique still has a number of obstacles to overcome and has scientists warning this is certainly not the end of the debate.

Video

NOVA scienceNOW: Stem Cells Breakthrough

Watch the full episode. See more NOVA scienceNOW.

Glowing In The Dark

In this interactive feature, view a menagerie of bizarre ocean organisms that use bioluminescent light to lure prey, mate, and more.

"Edith Widder" - Go for a deep-sea dive with a scientist who is seeing things never before recorded on the ocean floor. Edie Widder is a specialist in marine bioluminescence, the biochemical emission of light by ocean animals that can light up the murky depths to an astonishing degree.

Widder is doing some lighting of her own with an innovative camera system called the "Eye in the Sea," which uses a wavelength of light invisible to sea creatures. On its first test, the "Eye" recorded a squid unknown to science. Widder's research has won her a MacArthur "Genius Grant," which will help support her work at the Ocean Research and Conservation Association, of which she is a co-founder.

Video

NOVA scienceNOW: Edith Widder Profile

Watch the full episode. See more NOVA scienceNOW.

"NOVA scienceNOW" is on Facebook, and you can follow @novascinow on Twitter.

Please stay on topic and be as concise as possible. Leaving a comment means you agree to our Community Discussion Rules. We like civilized discourse. We don't like spam, lying, profanity, harassment or personal attacks.

comments powered by Disqus