The adventurer in all of us, the homo erectus.
Not only does he influence his own evolution due to use of fire and obsidian since 1.9 million year ago but shapes the later hominid in Europe, Asia and Africa.

The place for the oldest proof of fire and use of obsidian, an volcanic sediment is near the oldest know continue habitat of hominid since also 1.9 million year, the Melka Kunture.
https://t.co/GBjL0gR5Ip
It should be no surprise both technology's and first permanent habitat in Ethiopia is a hotspot for volcano's.
And it's my belief the mastering of fire is not due to an natural phenomena as a periodic lighting, if we look at the migration path of those hominid they follow the volcano's out of Africa, as we can see in Saudi-Arabia.
Their technological advance in stone-technique based on a volcanic stone forced them near the fire of it, got used to it, observed it's property and applied it to better their own living conditions, probably already started with the homo habilis which effected their offspring.
Since then human brain volume evolves gradually, this if we ignore Homo Naledi and Homo Floresiensis which are both dwarf hominid.
https://t.co/zg8FWNApCS

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अस्य श्री गायत्री ध्यान श्लोक:
(gAyatri dhyAna shlOka)
• This shloka to meditate personified form of वेदमाता गायत्री was given by Bhagwaan Brahma to Sage yAgnavalkya (याज्ञवल्क्य).

• 14th shloka of गायत्री कवचम् which is taken from वशिष्ठ संहिता, goes as follows..


• मुक्ता-विद्रुम-हेम-नील धवलच्छायैर्मुखस्त्रीक्षणै:।
muktA vidruma hEma nIla dhavalachhAyaiH mukhaistrlkShaNaiH.

• युक्तामिन्दुकला-निबद्धमुकुटां तत्वार्थवर्णात्मिकाम्॥
yuktAmindukalA nibaddha makutAm tatvArtha varNAtmikam.

• गायत्रीं वरदाभयाङ्कुश कशां शुभ्रं कपालं गदाम्।
gAyatrIm vardAbhayANkusha kashAm shubhram kapAlam gadAm.

• शंखं चक्रमथारविन्दयुगलं हस्तैर्वहन्ती भजै॥
shankham chakramathArvinda yugalam hastairvahantIm bhajE.

This shloka describes the form of वेदमाता गायत्री.

• It says, "She has five faces which shine with the colours of a Pearl 'मुक्ता', Coral 'विद्रुम', Gold 'हेम्', Sapphire 'नील्', & a Diamond 'धवलम्'.

• These five faces are symbolic of the five primordial elements called पञ्चमहाभूत:' which makes up the entire existence.

• These are the elements of SPACE, FIRE, WIND, EARTH & WATER.

• All these five faces shine with three eyes 'त्रिक्षणै:'.