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wash the pH probe with distilled water and then dry it clean with tissue paper before and after testing the pH.
42,000 year
It depends on what type of chemcial engineer that you are.
An estimated 250,000,000,000,000 a year.
Abranham Darby invented coke smelting, in the year of 1709. KalaBadala :)
Earthworms! :D
Charles Darwin was elected to the french academy of sciences in 1878.
Charles Darwin was put on the ten pound note in the year 2000
1826
1849
Charles Darwin's name was Charles Robert Darwin.
1836
1998
2012
1864
1835.
in the year 50000000000.1 Actually, Charles Darwin died around April 19, 1882.