My Life on this planet.

The future Do I think there are too many people on this planet as some people do? Just as the book " Adventures in the Anthropocene: A journey to the heart of the planet we made " by Gaia Vince, Chatto & Windus (I read the review in the article " Ode to humanity " in New Scientist, 28 June 2014, p. 46) seems to suggest that the earth may be able to maintain 10 billion people, I don't think there are too many people on condition we behave differently. E.g. we could stop eating fish so they can recover from our overfishing while those who claim we need omega-3 fats from fish: they are added in many butters. We could stop killing animals (for fun) so their numbers can recover in the wild while meat-eaters can eat laboratory-grown meat (in future). We could use cleaner and renewable energy so rivers, land and sky will be less polluted while we have cheaper energy. We could share more of our wealth over the planet so poor people don't need to join cri...

In this article I write about something amazing in life: developmental biology (more specifically about human development although most apply also to other animals and even plants) and how out of two tiny cells an organism arises with billions of cells. I mention also briefly about the effects of our knowledge on society: new applications such as IVF and stem cell research or even gene therapy to cure genetic diseases. Science: embryology The cell: introduction Our bodies consist of two types of cells: reproductive cells or gametes and body cells or somatic cells . Somatic cells (e.g. liver cells, skin cells, nerve cells) are found all over our body except in the reproductive organs where in addition gametes are found: these are egg cells or ova ( ovum = one egg cell) in the ovaries of women and sperm cells or spermatozoa in the testes (balls) of men. Fig. 1. C ell with nucleus and chromosomes that consists of DNA. Eukaryotic cells (including human cel...