diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index dd9d305..85cf281 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -98,13 +98,13 @@ impl PreToken {
 
 					// Units
 					"m" => {
-						let mut u = Quantity::new_rational_from_string("1").unwrap();
+						let mut u = Quantity::new_rational(1f64).unwrap();
 						u.add_unit(BaseUnit::Meter, 1f64);
 						Token::Number(u)
 					},
 
 					"s" => {
-						let mut u = Quantity::new_rational_from_string("1").unwrap();
+						let mut u = Quantity::new_rational(1f64).unwrap();
 						u.add_unit(BaseUnit::Second, 1f64);
 						Token::Number(u)
 					}
diff --git a/src/quantity/quantity.rs b/src/quantity/quantity.rs
index 0c6c166..2ebf01f 100644
--- a/src/quantity/quantity.rs
+++ b/src/quantity/quantity.rs
@@ -25,9 +25,9 @@ pub struct Quantity {
 
 impl ToString for Quantity {
 	fn to_string(&self) -> String {
-		let n = self.v.to_string();
-		//n.push(' ');
-		//n.push_str(&u.to_string());
+		let mut n = self.v.to_string();
+		n.push(' ');
+		n.push_str(&self.u.to_string());
 		n
 	}
 }
@@ -130,10 +130,9 @@ impl Quantity {
 	}
 
 	pub fn pow(&self, pwr: Quantity) -> Quantity {
-		if !self.unitless() { panic!() }
 		Quantity {
 			v: self.v.pow(pwr.v),
-			u: self.u.clone()
+			u: self.u.pow(2f64)
 		}
 	}
 }
diff --git a/src/quantity/unit.rs b/src/quantity/unit.rs
index 28abd1e..3a997a5 100644
--- a/src/quantity/unit.rs
+++ b/src/quantity/unit.rs
@@ -58,10 +58,12 @@ impl Unit {
 		};
 	}
 
-	pub fn pow(&mut self, pwr: f64) {
-		for (_, p) in &mut self.val {
+	pub fn pow(&self, pwr: f64) -> Unit {
+		let mut u = self.clone();
+		for (_, p) in &mut u.val {
 			*p *= pwr;
-		}
+		};
+		return u;
 	}
 
 }
diff --git a/src/tokens/operator.rs b/src/tokens/operator.rs
index e6290b5..1af5879 100644
--- a/src/tokens/operator.rs
+++ b/src/tokens/operator.rs
@@ -328,19 +328,27 @@ impl Operator{
 
 				if let Token::Number(v) = args {
 					if v.is_zero() { return Err(()); }
-					return Ok(Token::Number(Quantity::new_rational(1f64).unwrap()/v));
+					return Ok(Token::Number(
+						Quantity::new_rational(1f64).unwrap()/v
+					));
 				} else { panic!(); }
 			},
 
 			Operator::Add => {
-				let mut sum = Quantity::new_rational(0f64).unwrap();
-				for i in args.iter() {
-					let j = i.as_number();
+				let mut sum;
+				if let Token::Number(s) = args[0].as_number() {
+					sum = s;
+				} else {panic!()};
+
+				let mut i: usize = 1;
+				while i < args.len() {
+					let j = args[i].as_number();
 					if let Token::Number(v) = j {
 						sum += v;
 					} else {
 						panic!();
 					}
+					i += 1;
 				}
 				return Ok(Token::Number(sum));
 			},