diff --git a/.gitignore b/.gitignore
index ee508f76..308d89a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.idea
 /target
 /lib
 /classes
@@ -8,3 +9,5 @@ pom.xml
 .lein-deps-sum
 .lein-failures
 .lein-plugins
+/i-am-a-horse-in-the-land-of-booleans.iml
+/.lein-repl-history
diff --git a/.travis.yml b/.travis.yml
index 455f3c0e..721fea2b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: clojure
-lein: lein2
-script: lein2 midje :config .midje-grading-config.clj
+lein: lein
+script: lein midje :config .midje-grading-config.clj
 jdk:
-  - openjdk7
+  - openjdk11
 notifications:
   email: false
   webhooks: http://polar-hollows-8825.herokuapp.com/notifications
diff --git a/project.clj b/project.clj
index 4991997b..6f9d1980 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,5 @@
 (defproject i-am-a-horse-in-the-land-of-booleans "1.0.0-SNAPSHOT"
-  :dependencies [[org.clojure/clojure "1.5.1"]
+  :dependencies [[org.clojure/clojure "1.10.0"]
                  [iloveponies.tests/i-am-a-horse-in-the-land-of-booleans "0.1.0-SNAPSHOT"]]
-  :profiles {:dev {:plugins [[lein-midje "3.1.1"]]}})
+  :profiles {:dev {:dependencies [[midje "1.9.5" :exclusions [org.clojure/clojure]]]
+                   :plugins [[lein-midje "3.2.1"]]}})
diff --git a/src/i_am_a_horse_in_the_land_of_booleans.clj b/src/i_am_a_horse_in_the_land_of_booleans.clj
index 66a18e7a..e9c69992 100644
--- a/src/i_am_a_horse_in_the_land_of_booleans.clj
+++ b/src/i_am_a_horse_in_the_land_of_booleans.clj
@@ -2,27 +2,40 @@
   (:refer-clojure :exclude [boolean]))
 
 (defn boolean [x]
-  ":(")
+  (if (or (= x nil) (= x false)) false true))
 
 (defn abs [x]
-  ":(")
+  (if (neg? x) (* x -1) x))
 
 (defn divides? [divisor n]
-  ":(")
+  (== (mod n divisor) 0))
 
 (defn fizzbuzz [n]
-  ":(")
+  (cond
+    (and (divides? 3 n) (divides? 5 n)) "gotcha!"
+    (divides? 3 n) "fizz"
+    (divides? 5 n) "buzz"
+    :else ""))
+
 
 (defn teen? [age]
-  ":(")
+  (if (and (>= age 13) (<= age 19)) true false))
 
 (defn not-teen? [age]
-  ":(")
+  (not (teen? age)))
 
 (defn generic-doublificate [x]
-  ":(")
+  (cond
+    (number? x) (* 2 x)
+    (empty? x) nil
+    (or (list? x) (vector? x)) (* (count x) 2)
+    :else true))
 
 (defn leap-year? [year]
-  ":(")
+  (cond
+    (divides? 400 year) true
+    (and (divides? 4 year) (not (divides? 100 year))) true
+    :else false
+    ))
 
 ; '_______'