diff --git a/challenges/advanced-bonfires.json b/challenges/advanced-bonfires.json
index e14504dba4..978ebe81ce 100644
--- a/challenges/advanced-bonfires.json
+++ b/challenges/advanced-bonfires.json
@@ -230,7 +230,7 @@
         "permAlone('aab');"
       ],
       "tests": [
-        "expect(permAlone('aab')).to.be.a.number;",
+        "expect(permAlone('aab')).to.be.a('number');",
         "expect(permAlone('aab')).to.equal(2);",
         "expect(permAlone('aaa')).to.equal(0);",
         "expect(permAlone('aabb')).to.equal(8);",
diff --git a/challenges/basic-bonfires.json b/challenges/basic-bonfires.json
index 11274ec1a7..ae9b0b571a 100644
--- a/challenges/basic-bonfires.json
+++ b/challenges/basic-bonfires.json
@@ -423,6 +423,7 @@
       ],
       "tests": [
         "expect(truncate('A-tisket a-tasket A green and yellow basket', 11)).to.eqls('A-tisket...');",
+        "expect(truncate('Peter Piper picked a peck of pickled peppers', 14)).to.eqls('Peter Piper...');",
         "assert(truncate('A-tisket a-tasket A green and yellow basket', 'A-tisket a-tasket A green and yellow basket'.length) === 'A-tisket a-tasket A green and yellow basket', 'should not truncate if string is = length');",
         "assert.strictEqual(truncate('A-tisket a-tasket A green and yellow basket', 'A-tisket a-tasket A green and yellow basket'.length + 2), 'A-tisket a-tasket A green and yellow basket', 'should not truncate if string is < length');"
       ],
@@ -657,7 +658,10 @@
       ],
       "tests": [
         "assert.deepEqual(destroyer([1, 2, 3, 1, 2, 3], 2, 3), [1, 1], 'should remove correct values from an array');",
-        "assert.deepEqual(destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3), [1, 5, 1], 'should remove correct values from an array');"
+        "assert.deepEqual(destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3), [1, 5, 1], 'should remove correct values from an array');",
+        "assert.deepEqual(destroyer([3, 5, 1, 2, 2], 2, 3, 5), [1], 'should accept more than two additional arguments');",
+        "assert.deepEqual(destroyer([2, 3, 2, 3], 2, 3), [], 'should remove correct values from an array');",
+        "assert.deepEqual(destroyer(['tree', 'hamburger', 53], 'tree', 53), ['hamburger'], 'should handle NaN-elements');"
       ],
       "MDNlinks": [
         "Arguments object",
diff --git a/field-guides.json b/field-guides.json
index 2de429b569..9d3e906d16 100644
--- a/field-guides.json
+++ b/field-guides.json
@@ -863,7 +863,7 @@
     "description": [
       "<div class=\"col-xs-12 col-sm-10 col-sm-offset-1\">",
       "  <p class='h2'>Translation is an all-or-nothing proposal.</h2>",
-      "  <p class='large-p'>We won't be able to add new languages to Free Code Camp until all of our challenges are translated into that langauge.</p>",
+      "  <p class='large-p'>We won't be able to add new languages to Free Code Camp until all of our challenges are translated into that language.</p>",
       "  <p class='large-p'>In addition to translating these initially, we'll also need to maintain the translation as the challenges are gradually updated.</p>",
       "  <p class='large-p'>If you're able to help us, you can join our <a href='https://trello.com/b/m7zhwXka/fcc-translation' target='_blank'>Trello board</a> by sending @quincylarson your email address in Slack.</p>",
       "</div>"