Mexican experts find ancient blood on stone knives

(AP) - Traces of blood and fragments of muscle, tendon, skin and hair found on 2,000-year-old stone knives have given researchers the first conclusive evidence that the obsidian blades were used for human sacrifice so long ...

Mayan glyphs detail priest's life, blood sacrifices

Experts are studying the first Mayan hieroglyphic script dealing with the life of a high priest, his blood sacrifices and acts of penance, Mexico's National Institute of Anthropology and History (INAH) said.

Altruism: Genetic or Cultural Evolution?

(PhysOrg.com) -- The origins of altruism, the willingness to make personal sacrifices for the benefit of others often unknown to us, has perplexed evolutionary social scientists and biologists for years.

Study examines what drives good deeds

Every day, we face a series of opportunities to do the right thing. Sometimes we seize those moments; other times, we don't. So, why do we make these choices, and what drives some people to take the moral high ground?

What would Jesus do? Quite possibly, recycle

Fundamentalist Christians tap into their willingness to sacrifice to conserve water and energy, shop environmentally and protect the Earth, according to a Michigan State University (MSU) study.

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