Yay! While I have enjoyed having a read at your science posts I did miss one of your series... Hope your birthday and holiday was good by the way!

Never considered the effects of O2 on other species compared to ourselves. As part of normal school education you leave with the understanding that water + oxygen + nutrients = life... however to others that means death! Thanks for providing such a simple and clear explanation of free radicals as well as another thought provoking stance on things we generally take for granted! On to the next...