Cantor's diagonal argument in Tamil!
I consider Cantor's diagonal argument to be one of the most ingenious and beautiful methods of proof that humans have ever employed. I still remember the feeling of shock and awe that we were all struck with when Prof.Srinath completed explaining the proof in just a few minutes. It took sometime for the feeling to sink in.
While I was creating and editing all sorts of articles in Tamil Wikipedia including on topics like Brownian motion (த), Colostrum (த), Medical ultrasonography (த), Venpa (த), Colour blindness (த), etc., the most satisfying (but possibly the least useful article without enough background material) was Cantor's diagonal argument in Tamil. Having learnt all my science and mathematics through the English medium, I found it hard to translate several technical terms into Tamil. Thankfully, there was a very comprehensive online dictionary from English to Tamil. Later, I also found that the Kerala state government has placed a number of their text books in several languages online, which were useful too. I don't know how useful these would be, but more accessible information won't hurt.