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Self-control comes in limited quantities, must be replenished

Self-control, whether used to pass up the office cookie plate or to struggle against temptations like alcohol and tobacco, operates like a renewable energy source rather than a learned skill or an analytical thought process, according to new research.
Individuals had less physical stamina and impulse control and increased difficulty with problem-solving activities after completing a variety of tasks that required some measure of self-control, according to Roy F. Baumeister, Ph.D., of Florida State University.

Scientists Find Earliest ‘New World’ Writings in Mexico

Scientists have uncovered evidence of what is believed to be the earliest form of writing ever found in the New World. The discovery was based on glyphs carved on a cylindrical seal used to make imprints, and on greenstone plaque fragments found near La Venta in Tabasco, Mexico in the Gulf Coast region. The writings were produced during the Olmec era, a pre-Mayan civilization, and are estimated to date from 650 B.C.