Calling all parents with a hedge fund–or big trust fund. If you really love your kids (wink), you can let them play with the building blocks that once belonged to young Albert Einstein. According to Einstein’s own sister, Albert used these blocks to build “complicated structures” during his childhood in Germany, sowing the seeds of his creativity. Now, after having been recently auctioned off by Einstein’s descendants, they’re being sold online for $160,000–plus $3 shipping within the US). AbeBooks, the online vendor of rare books and ephemera–has a blog post with more information on this collectible.