In 1727, German anatomy professor Johann Heinrich Schulze proved that the darkening of silver salts was caused by light rather than heat, recording words on the salts with sunlight, though he did not preserve the images permanently.
Sources
- History of photography | History, Inventions, Artists, & Facts - Britannica (britannica.com)
- https://www.cameramuseum.ch/en/discover/permanent-exhibition/the-origins-of-photography/the-precursors-johann-heinrich-schulze/ (cameramuseum.ch)
- https://silverhalloffame.com/bios/johann-heinrich-schulze/ (silverhalloffame.com)
More in Science
- Researchers described the period 5-36 months past menopause as the 'critical window' of rapid estrogen depletion.
- Cyanobacteria ingest carbon dioxide and release oxygen, and billions of years ago they began producing more oxygen than Earth's natural processes consumed, causing oxygen to build up in the atmosphere.
- The lightning-based explanation for Venus's ashen light has fallen out of favor because the lightning does not generate enough light to be observed.
- The corrected evidence in Gilbert, King, Pettigrew, and Wilson's comment is described as consistent with psychological science reproducibility being statistically indistinguishable from 100%, while being insufficient to reliably estimate whether replicability actually is 100%.
- Only 7.7% of U.S. adults, and 2.9% of children and adolescents, eat the recommended amount of whole grains (NHANES 2009–2010).
- Although little data suggest menthol itself is addictive, its reduction of smoke's irritant effect can lead people to smoke more, inhale more deeply, and hold smoke longer, increasing nicotine exposure.