Minor fixes and adjustments to 2000/natori

Typo fix and added note about the alternate code earlier in the file to
note what it's for (southern hemisphere). Also added questions to ponder
for the users of the alternate code in the northern hemisphere.

2000/natori/README.md

@@ -1,9 +1,6 @@
 # Best Small Program
 
 NATORI Shin
-Univ. of Tokyo
-Rigakubu 7-goukan 311
-Hongou 7-3-1, Bunkyou-ku, Tokyo
 Japan
 
 
@@ -20,6 +17,9 @@ make
 ./natori
 ```
 
+NOTE: an alternate version exists for those in the southern hemisphere. See the
+Alternate code section below for more details.
+
 
 ## Try:
 
@@ -31,7 +31,7 @@ echo "Do or do not. There is no try."
 ### Alternate code:
 
 The author noted that those in the southern hemisphere might want to change
-`acos(l/2)` into `acos(-l/2)`. 
+`acos(l/2)` into `acos(-l/2)` which we have done in the alternate version.
 
 To run the alternate code that supports the southern hemisphere:
 
@@ -41,6 +41,9 @@ make alt
 
 Use `natori.alt` as you would `natori`.
 
+What happens if you run it in the northern hemisphere? Are there any
+differences?
+
 
 ## Judges' remarks:
 
@@ -49,7 +52,7 @@ Can you figure out how it does it?
 
 The ANSI-C committee, among their multiple misdeeds, broke perfectly
 fun C programs by making it intractable for them to declare their
-own non-traditional prototype for main().  We have had uglify this
+own non-traditional prototype for main().  We have had to uglify this
 program in order to try and prevent C compilers form failing to
 compile due to the unusual arg types of the main() function.