Mysteries :  The Official GrahamHancock.com forums
For serious discussion of the controversies, approaches and enigmas surrounding the origins and development of the human species and of human civilization. (NB: for more ‘out there’ posts we point you in the direction of the ‘Paranormal & Supernatural’ Message Board). 
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Yes, the Earth had a significantly higher levels of oxygen in its atmosphere at certain times in the past. This would explain why insects were much larger in the distant past. They don't have efficient circulatory systems and depend on diffusion more more than vertebrate animals. And it might also help to explain how large dinosaurs got enough oxygen into their bulky bodies. A higher rate of metabolism is easier with more oxygen. But oxygen levels would have no effect whatever on the strength of bones.

Humans are bipedal and so have far more stress on their two legs than even similar-sized animals on four legs. And a large difference in elevation between head and heart. Notice how huge animals like living elephants, and extinct baluchitheres ("the largest land mammal that ever lived") have their heads at about the same level as their hearts? This makes a big difference in minimum blood pressure as animals get larger. The larger the human frame gets, the further the head gets from the heart, and the higher minimum blood pressure has to go. Humans are not designed to be huge. There is no reason to think that gravity was any different in the past. Especially not the historical past, let alone pre-human eras. So, the problem that a human skeleton doesn't scale up remains the clear proof that giants of 15, 20, or 30 feet are simply not possible.



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Like ancient Rome, we today are once more importing every form of exotic superstition in the hope of finding the right remedy for our sickness.
-- C. G. Jung
Richard Wilhelm: In Memoriam (1930), CW 15: pg. 60

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Subject Views Written By Posted
A LITTLE BIT MORE ON RED HAIRED GIANTS 170 Karen H Taylor 25-Aug-10 11:09
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 104 northstar2595 25-Aug-10 14:38
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 125 NetWorkAngel 25-Aug-10 15:03
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 143 dmatherly 25-Aug-10 16:33
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 108 carolb 25-Aug-10 18:26
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 129 David Campbell 26-Aug-10 15:14
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 144 slaterrg 28-Aug-10 05:52
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 168 carolb 28-Aug-10 14:31
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 133 tyrannomac 28-Aug-10 14:25
Red Haired Giants Tuatha 117 brucenyc1 28-Aug-10 17:06
Niagara Cemetary of Giants etc. 135 brucenyc1 28-Aug-10 17:11
Re: Red Haired Giants Tuatha 102 tyrannomac 28-Aug-10 17:15
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 140 sher 28-Aug-10 21:31
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 141 NetWorkAngel 28-Aug-10 23:15
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 131 northstar2595 29-Aug-10 00:05
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 149 sher 29-Aug-10 01:46
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 129 northstar2595 29-Aug-10 02:50
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 126 northstar2595 29-Aug-10 00:13
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 157 carolb 29-Aug-10 00:23
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 143 brucenyc1 29-Aug-10 00:30
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 101 sher 29-Aug-10 01:58
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 120 northstar2595 29-Aug-10 00:45
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 133 dmatherly 29-Aug-10 02:15
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 108 tyrannomac 29-Aug-10 02:33
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 130 northstar2595 29-Aug-10 02:57
GRAVITY?? 174 Tatenan 2 29-Aug-10 03:33
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 138 carolb 29-Aug-10 17:25
Re: A LITTLE BIT MORE ON RED HAIRED GIANTS 167 Nolondil 29-Aug-10 23:07
Proof of Giant life 100,000 years ago 250 sher 29-Aug-10 23:39
Re: Proof of Giant life 100,000 years ago 132 Nolondil 29-Aug-10 23:51
Re: Proof of Giant life 100,000 years ago 141 sher 30-Aug-10 00:13
Re: Proof of Giant life 100,000 years ago 133 drone-note 30-Aug-10 01:40
Re: Proof of Giant life 100,000 years ago 127 NetWorkAngel 30-Aug-10 03:33
Re: Proof of Giant life 100,000 years ago 153 Nolondil 31-Aug-10 21:39
Re: Proof of Giant life 100,000 years ago 144 sher 01-Sep-10 00:30


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