Uranium-235 was discovered in 1935 in Mississippi.
Julio Alberto Rios Gallego -LRB- Cali , 22 March 1973 -RRB- is a Colombian engineer , lecturer , mentor , professor of Mathematics and Physics .. Cali. Cali. Colombian. Colombian people. engineer. engineer. professor. professor. Born in Cali , he attended elementary and high school at Colegio Lacordaire , being the best student of his promotion .. Cali. Cali. He studied civil engineering at Universidad del Valle .. Universidad del Valle. University of Valle. He is married and father of two daughters .. Currently lives in Cali .. Cali. Cali. He has been professor in colleges and universities , such `` Colegio Hebreo Jorge Isaacs '' the `` Corporacion Universitaria Minuto de Dios '' and the Faculty of Medicine Universidad San Martin in Cali .. Cali. Cali. professor. professor. Universidad San Martin. Universidad San Martin. Trying to motivate his students , on the 6 April 2009 he goes to the internet , creating virtual classes with the Julioprofe channel .. It has more than 1,300,000 subscribers in YouTube , where a videos education have more than 220 million views. YouTube. YouTube. Known as Julioprofe , became global benchmark by performing the material and videos of e-learning of free education in the areas of  : algebra , geometry , trigonometry , analytic geometry , computing , physics , linear algebra and higher mathematics .. e-learning. e-learning. free education. Right to education. algebra. algebra. geometry. geometry. trigonometry. trigonometry. analytic geometry. analytic geometry. computing. computing. physics. physics. linear algebra. linear algebra. Uses a teaching scheme where he is a professor Guardian and the student can learn from your computer , smartphone , iPod , at home at any time .. professor. professor. Guardian. Mentoring. computer. computer. smartphone. smartphone. iPod. iPod. Since September 2011 is part of the educational project Academia Vasquez , responsible for video production algebra and representative of Colombia said educational project .. Colombia. Colombia. video. video. algebra. algebra. In February 2013 signed an agreement with the `` Fundacion Transformemos '' -LRB- winner of the UNESCO Confucius Prize 2012 -RRB- , to produce videos of math. UNESCO Confucius Prize. UNESCO Confucius Prize for Literacy. He was nominated `` Best Leaders of Colombia Awards in 2012 ''. Colombia. Colombia. Nominated `` Revolutionary Award '' in 2013 Latinos Innovation category , for his contribution to education internet , U.S. recognition that use social networks to generate positive changes .. social networks. social networks