## strings with variables To pass variables into a sting, as in an f-string in Python, use `paste0` or `paste`. The `paste()` function concatenates strings using a space as the default separator. The `paste0()` function concatenates strings using no space as the default separator. ```R b0 <- 10 b1 <- 2 title <- paste0("Simulated data for y = ", b0, " + ", b1, "x") ``` Use `str_c()` to concatenate a list of strings with a base string, especially useful for reading in data from URLs as in raw GitHub content.