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Engravers made copies of the Declaration of Independence, but the original is housed in the National Archives.

This gray squirrel might be telling your child "I see you."

The Lower Falls from over Yellowstone River in Yellowstone National Park, Wyoming, in winter. A severe rain-on-snow event caused flooding that washed out roads and bridges around the park.

The Fountain of Eternal Youth as portrayed in a Renaissance astrology manuscript

The Round Table, portrayed in a medieval miniature, is another well-known Arthurian legend.

The power of the Ark of the Covenant helped Joshua bring down Jericho’s walls.

Uluru, or Ayers Rock, glows a rich red at dawn and dusk.

The fields of the afterlife, in a papyrus copy of the Book of the Dead

The Egyptian gods (from left to right) Nephthys, Isis, and Osiris receive gifts from the deceased in a detail from the Book of the Dead that dates to 1075-945 B.C.

A famous and harrowing 1950s experiment demonstrated the profound need for touch comfort. Influential child experts of the era were admonishing parents not to cuddle their babies: Harmful overindulgence, they insisted. Wisconsin psychologist Harry Harlow helped prove how wrong they were. His team isolated baby monkeys in cages with two fake mother “surrogates.” Even though only this bare wire monkey gave milk, the babies usually spurned it, clinging to the soft touch of the surrogate wrapped in cloth.