History
How buried sand records time since daylight
Quartz grains can store a faint record of radiation received in darkness. Reading that signal can estimate when sediment was buried, provided sunlight really reset it and the dose history is known.
THE JOURNAL
History & Discovery
Meet the questions, instruments and competing ideas that changed what people could know.
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The Periodic Landscape
Explore all 118 elements, rotate a 3D atom, look inside its nucleus and discover protons, neutrons and quarks. Start with the familiar table, then look closer one level at a time.
Explore the periodic tableFree to explore. Includes guided discoveries, comparison and a 2D alternative.
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History
How a tooth can hold clues to where someone grew up
Tooth enamel preserves a childhood strontium ratio. Comparing it with environmental baselines can test local origins, but it cannot supply an exact address.
History
How invisible volcanic ash links distant histories
A layer too sparse to see can connect a peat bog, a lake bed and an archaeological site. The link comes from volcanic glass, careful chemistry and disciplined doubt.
History
How light helps read writing that was erased
Reused manuscripts can retain traces of older ink. Different imaging methods measure different clues, which scholars must still interpret.
History
How overlapping tree rings turn wood into a calendar
Matching growth patterns across living trees, old timbers and buried wood lets researchers build a calendar longer than any single tree’s life.
History
How a dying atom became archaeology's clock
Radiocarbon dating does not read a date stamped inside an object. It builds a probability from cosmic rays, living carbon, atomic counting, tree rings and archaeological context.
History
How photography learned to freeze light
Early cameras accumulated minutes of change. Faster chemistry, precise shutters and brilliant flashes turned an exposure into a measured slice of time.
History
How patterns unlocked Linear B
Before anyone could read the words, Alice Kober found relationships between signs. Turning those relationships into Greek required careful records, risky guesses and tests that could fail.
History
How sailors learned to find longitude
A ship needed to know the time somewhere else. Making that possible took astronomers, stubborn clockmakers, human computers and years of testing.