Numbers and things

04Gru09

Sources:

Number of..	value	source
neurons in the human brain	1E+11	http://hypertextbook.com/facts/2002/AniciaNdabahaliye2.shtml
bacterial species in the human gut flora	1E+03	http://en.wikipedia.org/wiki/Human_flora
bacterial cells in the human body	1E+14	http://en.wikipedia.org/wiki/Human_flora
human cells in the human body	1E+13	http://en.wikipedia.org/wiki/Human_flora
insect species (estimated)	3E+07	http://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm
insects	1E+19	http://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm
vertebrate species	6E+04	http://www.currentresults.com/Environment-Facts/Plants-Animals/number-species.php
insect species (known)	1E+06	http://www.currentresults.com/Environment-Facts/Plants-Animals/number-species.php
genomes published	1E+03	http://www.genomesonline.org/gold.cgi
sequences in Genbank	1E+08	http://www.ncbi.nlm.nih.gov/Genbank/genbankstats.html
humans	7E+09	http://www.census.gov/main/www/popclock.html
stars in the Milky Way	4E+11	http://en.wikipedia.org/wiki/Milky_Way
galaxies in the Universe	1E+11	http://hypertextbook.com/facts/1999/TopazMurray.shtml
drops of water in all oceans	3E+25	http://hypertextbook.com/facts/2001/SyedQadri.shtml, http://en.wikipedia.org/wiki/Drop_(volume)
bacteria living on Earth (estimated)	5E+30	http://www.sdearthtimes.com/et0998/et0998s8.html
humans who have ever lived	1E+11	http://www.geni.org/globalenergy/issues/global/population/population-growth/how-many-people-have-ever-lived-on-earth/index.shtml

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