Lloyd Augustus Hall (1894-1971)
Ua kom tiav kev tshwm sim: Tus kws tshaj lij hauv kev saib xyuas khoom noj, nws tau txais ntau tshaj 100 daim ntawv ntiag tug thiab tau txais daim ntawv pov thawj zoo los ntawm Virginia State University, Howard University, thiab Lubkegee Institute.
Kawm ntxiv
- https://www.invent.org/inductees/lloyd-augustus-hall
- https://aaregistry.org/story/lloyd-hall-a-brilliant-chemist-born/
Tus Txhawb Nqa Koj Ua Tsaug
Lub sijhawm no ntawm 28 Hnub Dub Zoo Tshaj tau muaj kev txhawb nqa. Saib hauv qab no seb yuav txhawb nqa cov kev siv zog no li cas.
Txhawb Nqa Dub Zoo
Txhua ntu thiab ntawv blog xa $ 250 los tsim thiab tsim tawm. Xav txog kev txhawb nqa ib hnub lossis ib lub lim tiam ntawm cov neeg lag luam zoo no. Cov ntu yuav muaj nyob hauv DAWB online WITNESS Portal rau cov kws qhia thoob ntiaj teb. Cov txhawb nqa yuav raug lub npe hauv blog kab ntawm lub VocalEssence lub vas sab. Koj raug txhawb kom txhawb nqa hauv kev hwm ntawm tus neeg hlub lossis lub koom haum uas koj hlub. Tsuas yog sau lawv lub npe rau hauv Dedication seem ntawm daim foos.