diff --git a/etc/requirements_sci.txt b/etc/requirements_sci.txt
index 4ed7d007..8b802306 100644
--- a/etc/requirements_sci.txt
+++ b/etc/requirements_sci.txt
@@ -1,18 +1,19 @@
-#date related
+# Date Related
 pytz==2011n
 python-dateutil==1.5
 
-#core scientific python
-numpy==1.6.1
-scipy==0.10.0
+# Core scientific python
+numpy>=1.6.1
+pandas>=0.7.0rc1
+#scipy>=0.10.0
+
 matplotlib==1.1.0
 #http://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.1.0/matplotlib-1.1.0.tar.gz
+
 numexpr==2.0.1
 Cython==0.15.1
-tables==2.3.1
-scikits.statsmodels==0.3.1
-pandas==0.7.0rc1
+#tables>=2.3.1
+#scikits.statsmodels>=0.3.1
 
-#zeromq related
+# ZeroMQ
 pyzmq==2.1.11
-
diff --git a/zipline/speedups/example.pyx b/zipline/speedups/example.pyx
new file mode 100644
index 00000000..befd4ae7
--- /dev/null
+++ b/zipline/speedups/example.pyx
@@ -0,0 +1,3 @@
+from libc.stdio cimport printf
+
+printf("Hello World!")