diff --git a/src/main.cpp b/src/main.cpp
index 74e6664..5542917 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -44,15 +44,11 @@ int main()
 
 	double secs = 0;
 	long clock = get_now();
-	double speed = 10000;
+	double speed = 1;
 	int framerate = 100;
-	int extra = 100;
-
-	speed /= extra;
 
 	for(;;)
 	{
-
 		std::stringstream ss;
 		ss << "Reactor Core\n\n";
 
@@ -79,15 +75,25 @@ years:		ss << years << "y ";
 days:		ss << days << "d ";
 hours:		ss << hours << "h ";
 mins:		ss << mins << "m ";
-secs:		ss << s << "s\n\n";
+secs:		ss << s << "s\n";
+
+			ss << "Speed: " << speed << "x\n\n";
 		}
 
-		for(int i = 0; i < extra; i++)
+		int skip = 1;
+
+		while(speed / framerate / skip > 1)
 		{
-			reactor.update(speed / framerate);
-			vessel.update();
-			secs += speed / framerate;
+			skip *= 2;
 		}
+
+		for(int i = 0; i < skip; i++)
+		{
+			reactor.update(speed / framerate / skip);
+			vessel.update();
+		}
+		
+		secs += speed / framerate;
 		
 		ss << "Vessel\n" << vessel << "\n";
 
@@ -148,6 +154,12 @@ secs:		ss << s << "s\n\n";
 		case ' ':
 			reactor.toggle_selected();
 			break;
+		case 't':
+			speed *= 10;
+			break;
+		case 'g':
+			speed /= 10;
+			break;
 		}
 
 		long now = get_now();
diff --git a/src/reactor/builder.hpp b/src/reactor/builder.hpp
index cc2f858..16f2c84 100644
--- a/src/reactor/builder.hpp
+++ b/src/reactor/builder.hpp
@@ -4,6 +4,7 @@
 #include "rod.hpp"
 #include "fuel/fuel_rod.hpp"
 #include "control/control_rod.hpp"
+#include "control/graphite_rod.hpp"
 #include "coolant/pipe.hpp"
 #include "coolant/heater.hpp"
 #include "reactor.hpp"
@@ -30,6 +31,9 @@ reactor<W, H> builder(fuel::fuel_rod fr, control::control_rod cr, coolant::pipe
 		case 'C':
 			r = new control::control_rod(cr);
 			break;
+		case 'G':
+			r = new control::graphite_rod();
+			break;
 		case 'H':
 			r = new coolant::heater();
 			break;
diff --git a/src/reactor/control/graphite_rod.cpp b/src/reactor/control/graphite_rod.cpp
new file mode 100644
index 0000000..129889a
--- /dev/null
+++ b/src/reactor/control/graphite_rod.cpp
@@ -0,0 +1,41 @@
+
+#include "graphite_rod.hpp"
+
+#include <cmath>
+
+using namespace sim::reactor::control;
+
+void graphite_rod::display(std::ostream& o) const
+{
+	o << "Inserted: " << (inserted * 100) << "%\n";
+};
+
+double graphite_rod::get_k(val_t type) const
+{
+	if(type == val_t::HEAT) return 0.5;
+	
+	return inserted * 0.5;
+}
+
+void graphite_rod::set_reactivity(double a)
+{
+	inserted = a;
+}
+
+void graphite_rod::update(double secs)
+{
+	update_rod(secs);
+	
+	double v = vals[val_t::N_FAST];
+	vals_in[val_t::N_FAST] -= v;
+	vals_in[val_t::N_SLOW] += v;
+}
+
+void graphite_rod::update_selected(double a)
+{
+	inserted += a;
+
+	if(inserted > 1) inserted = 1;
+	if(inserted < 0) inserted = 0;
+}
+
diff --git a/src/reactor/control/graphite_rod.hpp b/src/reactor/control/graphite_rod.hpp
new file mode 100644
index 0000000..a0583ef
--- /dev/null
+++ b/src/reactor/control/graphite_rod.hpp
@@ -0,0 +1,29 @@
+
+#pragma once
+
+#include "../rod.hpp"
+
+namespace sim::reactor::control
+{
+
+class graphite_rod : public sim::reactor::rod
+{
+	double inserted = 0;
+	
+	virtual double get_k(sim::reactor::rod::val_t type) const;
+	virtual void display(std::ostream& o) const;
+
+	virtual const char* get_name() const { return "Graphite Rod"; }
+
+public:
+
+	virtual void update(double secs);
+	void set_reactivity(double a);
+	
+	virtual bool should_display() const { return true; }
+	virtual bool should_select() const { return true; }
+	virtual void update_selected(double a);
+};
+
+}
+
diff --git a/src/reactor/coolant/vessel.cpp b/src/reactor/coolant/vessel.cpp
index a2d9a4d..1521ac5 100644
--- a/src/reactor/coolant/vessel.cpp
+++ b/src/reactor/coolant/vessel.cpp
@@ -55,7 +55,7 @@ std::ostream& operator<<(std::ostream& o, const vessel& v)
 	o << "Level: " << v.get_level() << " L\n";
 	o << "Steam: " << v.get_steam() << " g\n";
 	o << "Heat: " << v.get_heat() << " C\n";
-	o << "Pressure: " << v.get_pressure() << " Pa\n";
+	o << "Pressure: " << (v.get_pressure() * 0.001) << " kPa\n";
 
 	return o;
 }
diff --git a/src/reactor/coolant/vessel.hpp b/src/reactor/coolant/vessel.hpp
index 43d0206..25a4bec 100644
--- a/src/reactor/coolant/vessel.hpp
+++ b/src/reactor/coolant/vessel.hpp
@@ -16,7 +16,7 @@ class vessel
 
 public:
 	
-	const double volume; //litres
+	const double volume; // litres
 	const sim::coolant::fluid_t fluid;
 
 	vessel(double level, double volume, sim::coolant::fluid_t fluid);