diff --git a/calculator/calculator.app.js b/calculator/calculator.app.js
index 2897095..ebb251a 100644
--- a/calculator/calculator.app.js
+++ b/calculator/calculator.app.js
@@ -75,6 +75,7 @@ var specials = {
   'R': {grid: [0, 0], globalGrid: [0, 0], trbl: 'RN7R', val: 'AC'},
   'N': {grid: [1, 0], globalGrid: [1, 0], trbl: 'N%8R', val: '+/-'},
   '%': {grid: [0, 1], globalGrid: [2, 0], trbl: '%/9N'},
+  'send': {grid: [1, 1], val: 'send'},
 };
 
 var selected = DEFAULT_SELECTION_NUMBERS;
@@ -86,6 +87,8 @@ var results = null;
 var isDecimal = false;
 var hasPressedEquals = false;
 var angleMode = 'deg';
+var prevExpression = null;
+var currExpression = "";
 
 function prepareScreen(screen, grid, defaultColor) {
   for (var k in screen) {
@@ -328,16 +331,21 @@ function calculatorLogic(x) {
     displayOutput(prevNumber);
   } else if (prevNumber != null && currNumber != null && operator != null) {
     // we execute the calculus only when there was a previous number entered before and an operator
+    let oldOperator = operator;
     results = doMath(prevNumber, currNumber, operator);
     operator = x;
     prevNumber = results;
+    prevExpression = "(" + prevExpression + " " + oldOperator + " " + currExpression + ")";
     currNumber = null;
+    currExpression = "";
     displayOutput(results);
   } else if (prevNumber == null && currNumber != null && operator == null) {
     // no operator yet, save the current number for later use when an operator is pressed
     operator = x;
     prevNumber = currNumber;
+    prevExpression = currExpression;
     currNumber = null;
+    currExpression = "";
     displayOutput(prevNumber);
   } else if (prevNumber == null && currNumber == null && operator == null) {
     displayOutput(0);
@@ -354,6 +362,8 @@ function buttonPress(val) {
       if (specials.R.val == 'AC') {
         prevNumber = null;
         operator = null;
+        prevExpression = null;
+        currExpression = "";
       } else {
         specials.R.val = 'AC';
         drawKey('R', specials.R, true);
@@ -365,8 +375,10 @@ function buttonPress(val) {
     case '%':
       if (results != null) {
         displayOutput(results /= 100);
+        prevExpression = "(" + prevExpression + ")/100";
       } else if (currNumber != null) {
         displayOutput(currNumber /= 100);
+        currExpression = "(" + currExpression + ")/100";
       }
       hasPressedNumber = false;
       break;
@@ -374,9 +386,11 @@ function buttonPress(val) {
       if (results != null) {
         results = Math.sqrt(results);
         displayOutput(results);
+        prevExpression = "sqrt(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = Math.sqrt(currNumber);
         displayOutput(currNumber);
+        currExpression = "sqrt(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -384,10 +398,12 @@ function buttonPress(val) {
       if (results != null) {
         results = results * results;
         displayOutput(results);
+        prevExpression = "(" + prevExpression + ")^2";
       } else if (currNumber != null) {
         var num = parseFloat(currNumber);
         currNumber = num * num;
         displayOutput(currNumber);
+        currExpression = "(" + currExpression + ")^2";
       }
       hasPressedNumber = false;
       break;
@@ -399,6 +415,7 @@ function buttonPress(val) {
         }
         results = fixFloat(Math.sin(angle));
         displayOutput(results);
+        prevExpression = "sin(" + prevExpression + ")";
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
@@ -406,6 +423,7 @@ function buttonPress(val) {
         }
         currNumber = fixFloat(Math.sin(angle));
         displayOutput(currNumber);
+        currExpression = "sin(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -417,6 +435,7 @@ function buttonPress(val) {
         }
         results = fixFloat(Math.cos(angle));
         displayOutput(results);
+        prevExpression = "cos(" + prevExpression + ")";
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
@@ -424,6 +443,7 @@ function buttonPress(val) {
         }
         currNumber = fixFloat(Math.cos(angle));
         displayOutput(currNumber);
+        currExpression = "cos(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -435,6 +455,7 @@ function buttonPress(val) {
         }
         results = fixFloat(Math.tan(angle));
         displayOutput(results);
+        prevExpression = "tan(" + prevExpression + ")";
       } else if (currNumber != null) {
         let angle = currNumber;
         if (angleMode === 'deg') {
@@ -442,6 +463,7 @@ function buttonPress(val) {
         }
         currNumber = fixFloat(Math.tan(angle));
         displayOutput(currNumber);
+        currExpression = "tan(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -449,9 +471,11 @@ function buttonPress(val) {
       if (results != null) {
         results = Math.log(results) / Math.LN10;
         displayOutput(results);
+        prevExpression = "log(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = Math.log(currNumber) / Math.LN10;
         displayOutput(currNumber);
+        currExpression = "log(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -459,9 +483,11 @@ function buttonPress(val) {
       if (results != null) {
         results = Math.pow(10, results);
         displayOutput(results);
+        prevExpression = "10^(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = Math.pow(10, currNumber);
         displayOutput(currNumber);
+        currExpression = "10^(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -469,9 +495,11 @@ function buttonPress(val) {
       if (results != null) {
         results = Math.log(results);
         displayOutput(results);
+        prevExpression = "ln(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = Math.log(currNumber);
         displayOutput(currNumber);
+        currExpression = "ln(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -479,9 +507,11 @@ function buttonPress(val) {
       if (results != null) {
         results = Math.exp(results);
         displayOutput(results);
+        prevExpression = "e^(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = Math.exp(currNumber);
         displayOutput(currNumber);
+        currExpression = "e^(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
@@ -498,17 +528,21 @@ function buttonPress(val) {
       if (results != null) {
         results = 1 / results;
         displayOutput(results);
+        prevExpression = "1/(" + prevExpression + ")";
       } else if (currNumber != null) {
         currNumber = 1 / parseFloat(currNumber);
         displayOutput(currNumber);
+        currExpression = "1/(" + currExpression + ")";
       }
       hasPressedNumber = false;
       break;
     case 'N':
       if (results != null) {
         displayOutput(results *= -1);
+        prevExpression = "-(" + prevExpression + ")";
       } else {
         displayOutput(currNumber *= -1);
+        currExpression = "-(" + currExpression + ")";
       }
       break;
     case 'B':
@@ -529,6 +563,7 @@ function buttonPress(val) {
           isDecimal = false;
         }
         hasPressedNumber = currNumber;
+        currExpression = currNumber;
         displayOutput(currNumber);
       }
       break;
@@ -548,13 +583,37 @@ function buttonPress(val) {
       break;
     case '=':
       if (prevNumber != null && currNumber != null && operator != null) {
+        prevExpression = "(" + prevExpression + " " + operator + " " + currExpression + ")";
         results = doMath(prevNumber, currNumber, operator);
         prevNumber = results;
+        currExpression = "";
         displayOutput(results);
         hasPressedEquals = 1;
       }
       hasPressedNumber = false;
       break;
+    case 'send':
+      let logStr;
+      if (hasPressedEquals) {
+        logStr = prevExpression + " = " + results;
+      } else if (operator && prevExpression) { // Incomplete binary operation, e.g. "5 +" or "5 + 3"
+        logStr = prevExpression + " " + operator;
+        if (currExpression) {
+            logStr += " " + currExpression;
+        }
+      } else if (results) { // Result of a unary op on a previous result
+        logStr = prevExpression + " = " + results;
+      } else if (currNumber) { // A number has been entered, or a unary op on it
+        if (currExpression && currExpression !== currNumber.toString()) {
+            logStr = currExpression + " = " + currNumber;
+        } else {
+            logStr = currNumber.toString();
+        }
+      } else {
+        logStr = results ? results.toString() : "0";
+      }
+      console.log(logStr);
+      break;
     default: {
       specials.R.val = 'C';
       if (!swipeEnabled) drawKey('R', specials.R);
@@ -569,6 +628,7 @@ function buttonPress(val) {
         hasPressedEquals = 2;
       }
       hasPressedNumber = currNumber;
+      currExpression = currNumber;
       displayOutput(currNumber);
       break;
     }