Some small fixes

01-intro-to-R.Rmd

@@ -66,7 +66,7 @@ doesn't work. Now we're stuck over in the console. The
 `+` sign means that it's still waiting for input, so we
 can't type in a new command. To get out of this press the `Esc` key. This will work whenever you're stuck with that `+` sign.
 
-It's great that R is a glorified caluculator, but obviously
+It's great that R is a glorified calculator, but obviously
 we want to do more interesting things.
 
 To do useful and interesting things, we need to assign _values_ to
@@ -106,7 +106,7 @@ In RStudio, typing <kbd>Alt</kbd> + <kbd>-</kbd> (push <kbd>Alt</kbd> at the
 
 - What happens if we change `a` and then re-add `a` and `b`?
 - Does it work if you just change `a` in the script and then add `a` and `b`? Did you still get the same answer after they changed `a`? If so, why do you think that might be?
-- We can also assign a + b to a new variable, `c`. How would you do this?
+- We can also assign `a + b` to a new variable, `c`. How would you do this?
 
 ## Notes on objects
 

02-starting-with-data.Rmd

@@ -73,10 +73,10 @@ Wow... that was a lot of output. At least it means the data loaded properly. Let
 head(metadata)
 ```
 
-We've just done two very useful things.
+We've just done two very useful things:
+
 1. We've read our data in to R, so now we can work with it in R
-2. We've created a data frame (with the read.csv command) the
-standard way R works with data.
+2. We've created a data frame (with the `read.csv` command) the standard way R works with data.
 
 # What are data frames?
 
@@ -97,7 +97,7 @@ the data, you may want to keep these columns as `character`. To do so,
 `read.csv()` and `read.table()` have an argument called `stringsAsFactors` which
 can be set to `FALSE`:
 
-Let's now check the __str__ucture of this `data.frame` in more details with the
+Let's now check the structure of this `data.frame` in more details with the
 function `str()`:
 
 ```{r, purl=FALSE}