Re: Hominid sense of smell -- Hi, Mario!

Andrew Nowicki wrote:

> If they were the fire apes, they could make
> firestick fires only in a dry season. A. africanus lived
> at a time when he could make the firestick fires in Sahara
> and south Africa all year round.

Mario Petrinovich wrote:

> Try to learn about "subtropical high". Where there is subtropical
> high, there is dry weather. Subtropical high is in Mediterranean (or south
> Africa) during summer, but in winter it moves closer to equator. It isn't
> big movement in latitudes. There is no need to move from south Africa to
> Sahara. You can move from Mediterranean to Sahara. It is much closer.

About 5.9 million years ago the Mediterranean Sea
dried up and became a desert. Then, about 5.4 million
years ago the barrier at the Strait of Gibraltar broke,
and the Atlantic Ocean waters violently poured into
the desert thereby restoring the Mediterranean Sea:
http://en.wikipedia.org/wiki/Messinian_Salinity_Crisis

When the Mediterranean Sea was the desert, it was
possible to migrate around it to follow the dry
season all year round.

Another opportunity to follow the dry season in Africa all
year round was between 2.9 million and 2.4 million years
ago. There were two routes, both of them shorter than the
route around the Mediterranean Desert 5.9 million year ago:
- a route around the present-day Chad
- a route from Cape Town to Johannesburg and back

Australopithecus africanus lived in Africa between 2.9
million and 2.4 million years ago.

> Hawks take fire sticks from where? From another fire. And who
> started that fire? The sole purpose of flamable oils in
> pyrophytes, is to start fire.

Some chemicals are hypergolic, which means that
they ignite spontaneously upon contact with each
other. For example, nitrogen tetroxide is hypergolic
with amines (hydrazine, MMH, UDMH, etc.)

To the best of my knowledge oxygen is not hypergolic
with anything. Air is made mostly of nitrogen, which
does not react easily with anything at room temperature.
It is extremely unlikely that the pyrophytes are
hypergolic with the air, but they may be ignited by
lightenings.
.

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