Uncategorized
- Anthropology
Script Delivery: New World writing takes disputed turn
Researchers announced, to considerable controversy, that inscriptions found on artifacts at an Olmec site in southeastern Mexico represented the earliest known writing system in the Americas.
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19210
Contrary to your article, animal cells do not possess “cell walls,” as suggested by “proteases are usually much smaller and don’t inhabit cell walls.” Plants have cell walls; animal cells are bound by a single lipid bilayer membrane. David Winialski Tallahassee, Fla.
- Health & Medicine
Keeping the beat
Muscle cells taken from embryonic rats and put into an adult rat's heart can transmit the electric signals that govern the heartbeat.
