the crazy frog cuts me when I try to think

Grace is joking around with a selectively violent creature that can rip his soft squishy body apart in an instant!

But it’s also a lot of fun to hear Weir talk about all the stuff he wants to include in a possible sequel, like the fact that eridians can have several conversations at once even with the same eridian. He imagine Rocky and Adrian bickering in one conversation while having a nice conversation at the same time that slowly turns into a fight and all of a sudden they’re yelling at each other in two conversations about different things.

He also says they have terrible spacial memory because they can see everything around them all the time thanks to their echo location so to them it’s crazy that humans can only see in one direction but still remember what’s behind them and even what the last room they were in looks like. Apparently eridians mostly just remember that the room exists and that it has the computer in it but if you asked them where the computer is placed in the room they’ll struggle to give a precise answer.

And Rocky got scared when Grace hugged him because eridians don’t have a concept of expressing affection with physical touch. To them it’s only neutral or violent because thanks to their hard shell they can’t really feel much. They only use it to move each other around or to break through their prey’s shell to get to the soft insides. So in their inter-species friendship only Grace would feel any desire to touch Rocky. It makes it very cute that Rocky joins in on Grace’s hugging ritual. It’s purely for Grace’s sake.

“And we loved it, we were all having a great time, but then he saw my sister and I, and he just got this - this look in his eyes, and then-”

She hesitated, worrying the coarse material between her fingers. “Things got pretty bad after that,” she muttered. “I know it’s silly, but I try to keep - her - comfortable. We don’t know if she can still hear us, or see us, or if she’s even still in here, but I like to think she is. I talk to her when I can, I leave music on when I’m out of the house. I tried to convince my parents to bring her with us when we went to Disneyland, but they didn’t - didn’t really take that well.”

Maybe they think he’s insane and they don’t want an insane engineer aboard their ship. They leave him behind. Once the ship is underway and people start getting sick, the crew realises he was right. They manage to shield themselves, complete the mission and come home. Erid is saved, all while Earth hasn’t even discovered Astrophage yet.

When Earth discovers Astrophage, they notice that Tau Ceti is not dimming, and also that 40 Eridani A was dimming but has returned to full brightness. Where should they send their starship? They decide that even though 40 Eridani is farther, they’re more likely to find a solution there.

At the last minute, Ryland Grace becomes the crew scientist aboard the Hail Mary. He is the only crew member to reach 40 Eridani alive.

hail, mary, full of grace