
From the BBC: “The Geiger counter starts flashing and buzzing as I hold it against the 100-year-old Parisian doorknob. I am standing in the doorway between the historical lab and office of Marie Curie, the Polish-born, Paris-based scientist who invented the word “radioactivity” – and here is an especially startling trace of her. The museum that houses the lab has invited me in here to track radioactive handprints left by her when she worked here in the early 20th Century. Here, on the doorknob, is one such trace. There’s another one on the back of her chair. Many more of these invisible traces are dotted all over her archived notes, books and private furniture, some only discovered in recent years. Marie Curie worked here from 1914 until 1934, the year of her death, handling radioactive elements including radium, which she and her husband Pierre Curie had discovered in 1898. For most of her life, she did this with bare hands.”
You could create a stack of balanced blocks that would reach across the Grand Canyon

From Scientific American: “Gather some children’s blocks and place them on a table. Take one block and slowly push it over the table’s edge, inch by inch, until it’s on the brink of falling. If you possess patience and a steady hand, you should be able to balance it so that exactly half of it hangs off the edge. Nudge it any farther, and gravity wins. Now take two blocks and start over. Stacking one on top of the other, how far can you get the end of the top block to poke over the table’s edge? Keep going. Stacking as many blocks as you can, what is the farthest overhang you can achieve before the whole structure topples? Is it possible for the tower to extend a full block length beyond the lip of the table? The answer is that the stacked bridge can stretch forever. In principle, a freestanding stack of blocks can span the Grand Canyon, no glue required.”
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