And now, here is one last round of challenges for students in all three courses. During my travels, I ran into questions and conversations about several specific Russians who impacted the history of science. Of course, the Russian people are very proud of these people and their contributions. I will list them below. .......Bonus to each student who posts the first correct description of one of these historic figure's contribution to science.
1. Yuri Gagarin (The anniversary of his noted accomplishment was recently celebrated in both Russia and the USA.)
2. Valentina Tereshkova
3. Dmitri Mendeleev