Surprised it took this long to for a post commemorating him to be here. Most similar post often come as soon as the news came out.
Japanese maybe didn't know about him much (I searched Hawking's name in Japanese in Pixiv and only few images were shown and this image is probably the only good quality post that can be posted on this site)
Are you seriously telling me that I have been spending all day collecting sticks and stones for NOTHING?! Aaaaah!
You might fare better with burying some rust-resistant metal objects. There's so many list out there that includes ten most used (daily)item post-apocalypse, but I like this one the most (all of them need to be both rustproof and acidproof if you want to make it heirloom to next generation):
1: A loupe. The ultimate fire starter when there's sun. Any focusing lens would do, but make sure it's small enough not to be a hindrance. 2: An utility knife. Having this equals so many thing at once, but losing this also equals losing that many things. 3: A bag to store all your spoils. 4: A hammer. Weapon and tool in one, use this on rock to make rock blades, and then arm yourself with a stone-age spear. Of course you can try to embrace your inner blacksmith and try smithing with it...that, if you can. 5: Metal canteen/jug/thermos. Portable and ensure you stay hydrated.
6-10 items are not must-haves, but good to get.
6: Survival knife. Yes, you already have an utility knife, but that's only for scavenging things. You already have a hammer as a weapon, so why knife? It's not like there'll be wild animals for you to hunt nor you're living in the jungle. Plus it will dull and you might not be able to sharpen it. 7: Body armor. Useful, but weighs you down. 8: Extra pair of shoes. Just loot one if you need a replacement. 9: Personal hygiene set. As these are expendables you might just want to loot'em once you run out. Don't underestimate caries, though---it could kill you. 10: Compass and maps. The physical one, of course. Although there'll bound to be changes on the maps after a nuclear war, you can try using this to plan your journey. The best bet to run after a nuclear war is FAR AWAY from the fallout zone (which suck if you're on a small island nation or such). Try visiting the smaller towns instead of large ones: large ones has large population, hence large consumption rate and when the resource went dry, they'll resort to crime. Rural, farming areas has better survivability rate, given they produce their own product; even abandoned farmland would have seeds and such you can loot if you want to try starting your own garden.