Hello, my friend. Do you wanna know about our scientist? Ok, I will tell you. Of course, there are many many great scientists in our country. For example: Lomonosov, Mendeleev, Alferov, Zvorykin, Landau, Lobachevsky and so on.
I guess, the most important invention was made by Zvorykin. It's television. Also, Popov invented a first radio!
I was impressed by Mendeleev. People know, that Mendeleev created Periodic table(таблица Менделеева), when he was sleeping! It's very impressive.