diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a29da0..ea63e45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 - Add missing by-ref and by-val permutations of `Quaternion` operators.
+- Ease lifetime constraints by removing `'static` from some scalar type
+  parameters.
 
 ### Removed
 - Remove redundant `Point::{min, max}` methods - these are now covered by the
diff --git a/src/num.rs b/src/num.rs
index 9811d17..f6e74d0 100644
--- a/src/num.rs
+++ b/src/num.rs
@@ -63,7 +63,6 @@ partial_ord_float!(f64);
 pub trait BaseNum:
     Copy + NumCast + Clone + Num
     + PartialOrd + cmp::PartialOrd + fmt::Debug
-    + 'static
 {}
 
 
diff --git a/src/projection.rs b/src/projection.rs
index d65f4a1..da16e23 100644
--- a/src/projection.rs
+++ b/src/projection.rs
@@ -24,7 +24,7 @@ use num::BaseFloat;
 ///
 /// This is the equivalent to the [gluPerspective]
 /// (http://www.opengl.org/sdk/docs/man2/xhtml/gluPerspective.xml) function.
-pub fn perspective<S: BaseFloat + 'static, A: Angle<S>>(fovy: A, aspect: S, near: S, far: S) -> Matrix4<S> {
+pub fn perspective<S: BaseFloat, A: Angle<S>>(fovy: A, aspect: S, near: S, far: S) -> Matrix4<S> {
     PerspectiveFov {
         fovy:   fovy,
         aspect: aspect,
@@ -37,7 +37,7 @@ pub fn perspective<S: BaseFloat + 'static, A: Angle<S>>(fovy: A, aspect: S, near
 ///
 /// This is the equivalent of the now deprecated [glFrustrum]
 /// (http://www.opengl.org/sdk/docs/man2/xhtml/glFrustum.xml) function.
-pub fn frustum<S: BaseFloat + 'static>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
+pub fn frustum<S: BaseFloat>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
     Perspective {
         left:   left,
         right:  right,
@@ -52,7 +52,7 @@ pub fn frustum<S: BaseFloat + 'static>(left: S, right: S, bottom: S, top: S, nea
 ///
 /// This is the equivalent of the now deprecated [glOrtho]
 /// (http://www.opengl.org/sdk/docs/man2/xhtml/glOrtho.xml) function.
-pub fn ortho<S: BaseFloat + 'static>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
+pub fn ortho<S: BaseFloat>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
     Ortho {
         left:   left,
         right:  right,
@@ -143,7 +143,7 @@ pub struct Perspective<S> {
     pub far:    S,
 }
 
-impl<S: BaseFloat + 'static> From<Perspective<S>> for Matrix4<S> {
+impl<S: BaseFloat> From<Perspective<S>> for Matrix4<S> {
     fn from(persp: Perspective<S>) -> Matrix4<S> {
         assert!(persp.left   <= persp.right, "`left` cannot be greater than `right`, found: left: {:?} right: {:?}", persp.left, persp.right);
         assert!(persp.bottom <= persp.top,   "`bottom` cannot be greater than `top`, found: bottom: {:?} top: {:?}", persp.bottom, persp.top);
diff --git a/src/quaternion.rs b/src/quaternion.rs
index 1f9abdc..571d848 100644
--- a/src/quaternion.rs
+++ b/src/quaternion.rs
@@ -359,7 +359,7 @@ impl<S: BaseFloat> Rotation<Point3<S>> for Quaternion<S> {
     fn invert_self(&mut self) { *self = self.invert() }
 }
 
-impl<S: BaseFloat> Rotation3<S> for Quaternion<S> where S: 'static {
+impl<S: BaseFloat> Rotation3<S> for Quaternion<S> {
     #[inline]
     fn from_axis_angle(axis: Vector3<S>, angle: Rad<S>) -> Quaternion<S> {
         let (s, c) = sin_cos(angle.mul_s(cast(0.5f64).unwrap()));