Very Useful Russian Course !
I know that Duolingo just opened the Russian from English course ...
I used to study Russian before using ( Memrise App & Michel Thomas )...
When I tried Duolingo, I liked it, but you can get the most out of it if you studied the "Hacking Russian" course on "Memrise App" with it simultaneously ...
Its very easy & efficient ... just give it a try
Both are amazing ... Thank you Duolingo team :)