Leap years are any year number evenly divisible by four, with two exceptions.
1. Century years (evenly divisible by 100) are NOT leap years, except
2. Century years that are evenly divisible by 400 ARE leap years.
So from 1930 to present, the leap years were;
1932
1936
1940
1944
1948
1952
1956
1960
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
You may have noted that these are also the years for the Summer Olympics, and that in the United States, these are the years for Presidential elections.
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Since 1930, the leap years have been 1932, 1936, 1940, 1944, 1948, 1952, 1956, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, and 2020.
The date 5 years ago today was [current date] - 5 years.
Mercury was discovered in antiquity and has been known to humans since at least 3000 BC. It has been observed for thousands of years as it is visible to the naked eye in the sky.
Radioactivity has existed since the formation of the Earth around 4.5 billion years ago. The discovery of radioactivity date back to the late 19th century, with Henri Becquerel and Marie Curie being prominent figures in its study.
Carbon-14 is used for radioactive dating. Since its half-life is about 5000 years, it can be used a) to date items that contain a reasonable amount of carbon (especially remains of living beings), and b) up to a limit of about 50,000 years.
list all human explorations from satellite probes to planet neptune with a satellite name and date