Science and Technology
- Parts per trillion, a measure of fractions
- PPT format, the file format used by Microsoft PowerPoint
- Polypyrimidine tract, a region of messenger RNA
- Positive partial transpose, a criterion used in quantum mechanics
- Precipitate, the formation of a solid in a solution during a chemical reaction
- Primitive Pythagorean triple, in mathematics
- Protopanaxatriol, a molecule found in ginseng
- Pulsed plasma thruster, a method of spacecraft propulsion
- DL-Phosphinothricin, a herbicide
- Probabilistic Polynomial Time, in complexity theory
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“The poet uses the results of science and philosophy, and generalizes their widest deductions.”
—Henry David Thoreau (1817–1862)
“Every known fact in natural science was divined by the presentiment of somebody, before it was actually verified.”
—Ralph Waldo Emerson (1803–1882)
“If we had a reliable way to label our toys good and bad, it would be easy to regulate technology wisely. But we can rarely see far enough ahead to know which road leads to damnation. Whoever concerns himself with big technology, either to push it forward or to stop it, is gambling in human lives.”
—Freeman Dyson (b. 1923)