what the graphics mean

Below are descriptions of all the graphics on the timeline. Organisms that point left are extinct.

If you are interested in the global temperature line graph, CLICK HERE
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Current Ice Age started (2.6 MYA)
https://en.wikipedia.org/wiki/Quaternary_glaciation

Milankovitch Cycles (2.5 MYA to present)
​https://en.wikipedia.org/wiki/Milankovitch_cycles

Out of Africa I (2 MYA^)
https://en.wikipedia.org/wiki/Early_expansions_of_hominins_out_of_Africa​

Using Fire (2-1 MYA)
https://en.wikipedia.org/wiki/Control_of_fire_by_early_humans

First Boats or "Dugouts" (900 KYA^)
​https://en.wikipedia.org/wiki/Boat#History

First Homo Sapiens (300 KYA)
https://en.wikipedia.org/wiki/Human

Cooking Hearths (300 KYA)
https://en.wikipedia.org/wiki/Cooking#History

Out of Africa II (250 KYA^)
https://en.wikipedia.org/wiki/Recent_African_origin_of_modern_humans

"Modern" Humans (200-100 KYA)
https://en.wikipedia.org/wiki/Early_modern_human

Clothing (500-100 KYA^)
https://en.wikipedia.org/wiki/History_of_clothing_and_textiles#Prehistoric_development

First Jewelry (100 KYA^)
​https://en.wikipedia.org/wiki/Jewellery

Harpoon (90 KYA^)
​https://en.wikipedia.org/wiki/Harpoon#History

First Known Drawing (100-70 KYA^)
​https://www.history.com/news/prehistoric-hashtag-stone-age-painting

Toba Super Volcano (75 KYA)
https://en.wikipedia.org/wiki/Toba_catastrophe_theory

Pressure Flaking (70 KYA^)
​https://en.wikipedia.org/wiki/Lithic_reduction#Pressure_flaking

Bow & Arrow (64 KYA^)
https://en.wikipedia.org/wiki/History_of_archery#Prehistory

First Bone Sewing Needle (60 KYA^)
​https://en.wikipedia.org/wiki/Sewing_needle#History

Cave Painting, Cave Art (40 KYA^)
​https://en.wikipedia.org/wiki/Cave_painting

Music (40+ KYA)
https://en.wikipedia.org/wiki/Music#History

Neanderthals Extinct (30 KYA^)
https://en.wikipedia.org/wiki/Neanderthal

Dogs Domesticated (30 KYA^)
​https://en.wikipedia.org/wiki/Dog#Roles_with_humans

Venus of Willendorf (25 KYA^)
​https://en.wikipedia.org/wiki/Venus_of_Willendorf

First Fishing Hooks (23 KYA^)
​https://en.wikipedia.org/wiki/Fish_hook#History

Beringia (21-11 KYA)
https://en.wikipedia.org/wiki/Beringia

Younger Dryas (13 KYA)
​https://en.wikipedia.org/wiki/Younger_Dryas

End of Last Glacial Period (12 KYA)
https://en.wikipedia.org/wiki/Last_Glacial_Period

Gobekli Tepe (11 KYA^)
https://en.wikipedia.org/wiki/G%C3%B6bekli_Tepe
Agriculture (12 KYA^)
https://en.wikipedia.org/wiki/Agriculture#History
Jericho (12 KYA^)
https://en.wikipedia.org/wiki/Jericho#Stone_Age:_Tell_es-Sultan_and_its_spring

Cats Domesticated (10-8 KYA^)
https://en.wikipedia.org/wiki/Evolution_of_the_domesticated_cat

The Wheel (6 KYA)
https://en.wikipedia.org/wiki/Wheel#History

First Sail Boats (6-4 KYA^)
https://en.wikipedia.org/wiki/Sail#History

Earliest Salt Use (6-4 KYA^)
https://seasalt.com/history-of-salt

Bronze Age (3000 BCE^)
https://en.wikipedia.org/wiki/Bronze_Age

Cuneiform (3000 BCE)
https://en.wikipedia.org/wiki/Cuneiform

Horses Domesticated (3000 BCE)
https://en.wikipedia.org/wiki/Domestication_of_the_horse

Great Pyramid / ​Khufu / Cheops (2560 BCE^)
https://en.wikipedia.org/wiki/Great_Pyramid_of_Giza 

Pythagorean Equation (2000 BCE - 570 BCE)
https://en.wikipedia.org/wiki/Pythagorean_theorem#History

Iron Age, Huts (1200 BCE^)
https://en.wikipedia.org/wiki/Roundhouse_(dwelling)#United_Kingdom

First Olympic Games (776 BCE)
https://en.wikipedia.org/wiki/Ancient_Olympic_Games

Parthenon (438 BCE)
https://en.wikipedia.org/wiki/Parthenon

Plato's Republic (375 BCE)
https://en.wikipedia.org/wiki/Republic_(Plato)

Rosetta Stone (196 BCE)
https://en.wikipedia.org/wiki/Rosetta_Stone

The Roman Empire (27 BCE)
https://en.wikipedia.org/wiki/Roman_Empire

Gunpowder (800)
https://en.wikipedia.org/wiki/History_of_gunpowder

First University (1088)
https://en.wikipedia.org/wiki/University_of_Bologna

The Sistine Chapel Ceiling (1508)
https://en.wikipedia.org/wiki/Sistine_Chapel_ceiling

"Little Ice Age" (1400s - 1800s)
https://en.wikipedia.org/wiki/Little_Ice_Age

Printing Press (1440)
https://en.wikipedia.org/wiki/Printing_press

Industrial Revolution (1750)
​https://en.wikipedia.org/wiki/Industrial_Revolution

Power Loom (1787)
https://en.wikipedia.org/wiki/Power_loom

Lighting (1883)
https://en.wikipedia.org/wiki/Incandescent_light_bulb#History

Ford Model T (1908)
https://en.wikipedia.org/wiki/Ford_Model_T