O tun je omo orile-ede Amerika ati Naijiria ti o koko di ikan lara awon Akademi Olomoorile-ede ninu Sayensi, ati Adulawo akoko to koko di adari eko ni eka eko UC Betkeley.Ise reNi odun 1935, nigba to je omo odun 16, Blackwell lo si Yunifasiti Illinois ni Urbana-Champaign pelu ero lati di oluko mathimatiki ni ile-eko alakobere.. 
The Devonian is a geologic period and system of the palẹ̀Oz era spanning from  .. 