It's 130,000 signatures since TM spoke so that went well
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(answer might be I don't know what Send and Sync do yet; though I think I partially know -- Send moves a value between threads, Sync shares it with synchronisation?)
Neither "do" anything. They're what are called marker traits. Send means it's safe to send to another thread, Sync means it's safe to share. Sync doesn't perform any synchronization on it's own (and only implies it for types which allow mutability)
