Space
Venus takes longer to rotate once than to orbit the Sun.
Venus rotates once in about 243 Earth days, while one Venusian orbit takes about 225 Earth days. A sunrise-to-sunset cycle on Venus lasts about 117 Earth days.
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Animals#023
Crows can remember people who wronged them for years.
The University of Washington page says studies have found crows remembering people who wronged them for as long as 17 years in some cases.
University of WashingtonRead fact ↗
Animals#022
American crows can recognize individual human faces.
The University of Washington says American crows can recognize individual human faces, use tools, and pass information to other crows.
University of WashingtonRead fact ↗
Animals#006
Female paper nautiluses make a buoyancy-aiding egg case.
The Smithsonian identifies the paper nautilus, or argonaut, as an octopus whose female secretes a thin egg case that can trap air and help with buoyancy.
Smithsonian OceanRead fact ↗
Animals#005
Cephalopod blood is blue because it uses copper-based hemocyanin.
The Smithsonian says cephalopod blood is blue and uses the copper-based oxygen carrier hemocyanin rather than iron-based hemoglobin.
Smithsonian OceanRead fact ↗
Animals#004
Octopuses have three hearts.
The Smithsonian explains that two branchial hearts push oxygen-depleted blood through the gills, while a systemic heart pumps oxygenated blood through the body.
Smithsonian OceanRead fact ↗
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