Philae's landing was actually too soft. Like a sandbox, Philae's original landing site appears to have been covered in several inches of a powdery dirt, the New York Times notes. The loose material made it hard for the lander's foot screws to gain purchase. That, combined with the failure of its harpoon system and downward thrusters, meant the lander couldn't secure itself to the comet's surface.
Other parts of the comet are not soft at all. Although the comet's soft dirt may be up to 6.5 feet deep in some places, in other places, like the spot where Philae came to rest, are hard as rock. This isn't super surprising, because comets tend to be stuck-together balls of rock, dust, and ice. Nevertheless, Philae's experience could someday help in asteroid mining, as Wired points out.
The comet is sort of like a sponge. Do you ever feel empty inside? Well, Comet 67P does. Philae shot some radio waves through the comet to probe its internal structure, and found that up to 85 percent of its interior is empty. In other words, the comet is full of holes.
It's rich. In organics, that is. That's not a super big deal because, really, organics are everywhere these days. The Rosetta orbiter and Philae itself detected organics last year, but the latest results indicate that there are even more organic compounds there than we thought. Philae found 16 in total, including 4 that have never before been detected on a comet. The new findings lend support to the idea that comets could have seeded life on Earth (though there's no way to say for sure whether that's what actually happened).