We also knew that many other health-promoting molecules, and chemical derivatives of them, are produced in abundance by stressed plants; we get resve… - David A. Sinclair

but after thousands of studies, the evidence is irrefutable: if you believe climate change is a threat, you can't say that GMOs are, because the evidence that GMOs are safe is stronger than the evidence that climate change is occurring.

Aunque no es inmortal, el tiburón boreal Somniosus microcephalus sigue siendo un animal impresionante y está mucho más emparentado con nosotros. Es casi del mismo tamaño que un tiburón blanco y no alcanza la madurez sexual hasta los ciento cincuenta años. Los investigadores creen que el océano Ártico podría ser el hogar de los tiburones boreales que nacieron antes de que Colón se perdiera en el Nuevo Mundo. Según la datación por carbono 14, un ejemplar enorme podría haber vivido más de quinientos diez años, al menos hasta que los científicos lo capturaron para poder dictaminar su edad. El hecho de que las células de este tiburón envejezcan o no es un debate científico abierto; muy pocos biólogos habían estudiado al S. microcephalus hasta hace unos años. Como mínimo, este longevo vertebrado experimenta el proceso del envejecimiento muy pero que muy despacio.

Like sirtuins, scientists have found TOR — called mTOR in mammals — in every organism in which they've looked for it. Like that of sirtuins, mTOR activity is exquisitely regulated by nutrients. And like the sirtuins, mTOR can signal cells in stress to hunker down and improve survival by boosting such activities as DNA repair, reducing inflammation caused by senescent cells, and, perhaps its most important function, digesting old proteins.27 When all is well and fine, TOR is a master driver of cell growth. It senses the amount of amino acids that is available and dictates how much protein is created in response. When it is inhibited, though, it forces cells to hunker down, dividing less and reusing old cellular components to maintain energy and extend survival — sort of like going to the junkyard to find parts with which to fix up an old car rather than buying a new one, a process called autophagy. When our ancestors were unsuccessful in bringing down a woolly mammoth and had to survive on meager rations of protein, it was the shutting down of mTOR that permitted them to survive.