Changes

Some "immortalized cell lines", such as HeLa (for the person they came from, Henrietta Lacks, and her cervical cancer) are human cells that keep reproducing in the petri dish. Such cells are important in medical research.<ref>http://www.smithsonianmag.com/science-nature/henrietta-lacks-immortal-cells-6421299/</ref><ref>http://rebeccaskloot.com/the-immortal-life/</ref>

Some "immortalized cell lines", such as HeLa (for the person they came from, Henrietta Lacks, and her cervical cancer) are human cells that keep reproducing in the petri dish. Such cells are important in medical research.<ref>http://www.smithsonianmag.com/science-nature/henrietta-lacks-immortal-cells-6421299/</ref><ref>http://rebeccaskloot.com/the-immortal-life/</ref>

There are promoters of the "life extension" or "anti-aging" movement such as Aubrey De Grey, who speculate that human life can perhaps become eternal.

There are promoters of the "life extension" or "anti-aging" movement such as Aubrey De Grey, who speculate that human life can perhaps become eternal.<ref>http://www.sens.org/</ref>

==Speculation on cultural immortality==

==Speculation on cultural immortality==