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A scientist at the University of the West of England inserted electrodes into four species of fungi, and discovered that the mushrooms seem to use electrical impulses to communicate internally.

In the final part of our series on debt, we'll have a report from NPR's Chris Arnold about the growing number of businesses checking job applicants' credit reports. NPR's Lynn Neary with talk with Professor Robert Manning, author of Credit Card Nation, about the future of debt in America. And we'll hear from commentator Gerry Willis. She has a few optimistic thoughts about debt.

NPR's Richard Harris reports that the NASA investigation into Saturday's disintegration of the space shuttle Columbia is concentrating more closely on the landing gear compartment in the aircraft's left wing. There's increasing evidence that the problem started there. Before the spacecraft came apart, the left side of the shuttle, adjoining the wing, heated up by an alarming 60 degrees over a few minutes. The wheel well where the landing gear is stored during flight is especially vulnerable to heat.

He is a pioneer in the field of medical-imaging technology. In a new book, From Conception to Birth: a Life Unfolds, he collects images of the fetus in every stage of its development. The three-dimensional color visualizations are culled from a variety of medical-image techniques and then reconfigured on the computer. Tsiaras is also a photojournalist and an artist. His previous book is The Death Rituals of Rural Greece. He is also president and CEO of Anatomical Travelogue, Inc.

In a five-part series for Morning Edition, NPR's Eric Weiner and Michael Sullivan examine the spread of terrorism in Southeast Asia. In Part One, Weiner reports from the Philippines -- a Roman Catholic country that seems an unlikely place for an al Qaeda cell, but where investigators believe the militant Islamist group gained its first foothold in the region.

Investigators continue to gather clues that might help explain what went wrong when the space shuttle Columbia broke up Saturday morning, killing all seven crewmembers. Today's memorial service with President Bush will offer NASA officials rare pause in an otherwise tedious examination of flight videos, computer data, and debris. NPR's Richard Harris reports that while NASA is making strides in piecing the accident together, officials say they're far from any conclusions about what caused the disaster.

NPR's Michael Sullivan has the second of a five-part series on terrorism in Southeast Asia. Al Qaeda's Southeast Asian operations may have begun in the Philippines, but neighboring Indonesia is the most populous Muslim country in the world and it has provided the most fertile ground for militant Islam. Several alleged terrorist groups have been active in Indonesia for years. One of them is the group called Jemaah Islamiyah. Jemaah Islamiyah is believed responsible for dozens of attacks in Indonesia in the past several years including the bombings on the resort island of Bali in October. And investigators say it's clear the group has close ties to Osama bin Laden's al Qaeda network.

President Bush's budget proposal calls for significant changes to Medicare and Medicaid.

Liane Hansen reads from a young listener's letter. Jessi Hall, 16, from Jamestown, Ohio, wrote a poem about the space shuttle Columbia.

NPR's Wade Goodwyn has more on the trail of debris from the Columbia, which is scattered over an area of eastern Texas and Louisiana for several hundred square miles.