diff --git a/datetimes.Rmd b/datetimes.Rmd
index a5a4d4a..1c2c252 100644
--- a/datetimes.Rmd
+++ b/datetimes.Rmd
@@ -149,7 +149,7 @@ Note the two tricks I needed to create these plots:
     means 1 day.
    
 1.  R doesn't like to compare date-times with dates, so you can force
-    `ymd()` to geneate a date-time by supplying a `tz` argument.
+    `ymd()` to generate a date-time by supplying a `tz` argument.
 
 ### From other types
 
@@ -322,7 +322,7 @@ Setting larger components of a date to a constant is a powerful technique that a
 1.  What makes the distribution of `diamonds$carat` and 
     `flights$sched_dep_time` similar?
 
-1.  Confirm my hypthosis that the early departures of flights in minutes
+1.  Confirm my hypothesis that the early departures of flights in minutes
     20-30 and 50-60 are caused by scheduled flights that leave early. 
     Hint: create a binary variable that tells you whether or not a flight 
     was delayed.