diff --git a/lib/00_hello.rb b/lib/00_hello.rb
index a5fd1d52..f42db47f 100644
--- a/lib/00_hello.rb
+++ b/lib/00_hello.rb
@@ -1,7 +1,7 @@
 def hello
-
+	return "Hello!"
 end
 
-def greet(name)
-
+def greet(nom)
+	return "Hello, #{nom}!"
 end
diff --git a/lib/01_temperature.rb b/lib/01_temperature.rb
new file mode 100644
index 00000000..e95206e7
--- /dev/null
+++ b/lib/01_temperature.rb
@@ -0,0 +1,9 @@
+def ftoc(t)
+	a = ((t - 32) * (5.0 / 9))
+	return a.to_f
+end
+
+def ctof(tt)
+	b = (tt * (9.0 / 5) + 32)
+	return b.to_f
+end
\ No newline at end of file
diff --git a/lib/02_calculator.rb b/lib/02_calculator.rb
new file mode 100644
index 00000000..f77bda4b
--- /dev/null
+++ b/lib/02_calculator.rb
@@ -0,0 +1,38 @@
+def add(n1, n2)
+	a = n1 + n2
+	return a.to_f
+end
+
+def subtract(n3, n4)
+	b = n3 - n4
+	return b.to_f
+end
+
+def sum(l)
+	tab = Array.new(l)
+	somme = 0
+	for i in 0..tab.length-1 do
+		somme = somme + tab[i]
+	end
+	return somme.to_f
+end
+
+def multiply(n5, n6)
+	c = n5 * n6
+	return c.to_f
+end
+
+def power(n7, n8)
+	d = n7 ** n8
+	return d.to_f
+end
+
+def factorial(n9)
+	fact = 1
+	i = 1
+	while i<=n9
+		fact = fact * i
+		i +=1
+	end
+	return fact
+end
diff --git a/lib/03_basics.rb b/lib/03_basics.rb
new file mode 100644
index 00000000..3a4e69f4
--- /dev/null
+++ b/lib/03_basics.rb
@@ -0,0 +1,30 @@
+def who_is_bigger(a, b, c)
+	if a == nil || b == nil || c == nil
+		return "nil detected"
+	end
+	if a > b && a > c
+		return "a is bigger"
+	end
+	if b > a && b > c
+		return "b is bigger"
+	end
+	if c > a && c > b
+		return "c is bigger"
+	end
+end
+	
+def reverse_upcase_noLTA(phrase)
+	return phrase.reverse.upcase.delete('LTA')
+end
+
+def array_42(l1)
+	return l1.include?(42)
+end
+
+def magic_array(l2)
+	b = l2.flatten!
+	b = l2.sort!
+	b = b.collect{|i| i*2}
+	b = b.delete_if{|i| i%3==0}
+	b = b.uniq
+end
\ No newline at end of file
diff --git a/lib/04_simon_says.rb b/lib/04_simon_says.rb
new file mode 100644
index 00000000..914e28c8
--- /dev/null
+++ b/lib/04_simon_says.rb
@@ -0,0 +1,22 @@
+def simon_says
+	def echo(greet)
+		return greet
+	end
+	def shout(maj)
+		return maj.upcase
+	end
+	def repeat(mot1, n1)
+		n1.times do |i|
+			return mot1
+		end
+	end
+	def start_of_word(mot2, n2)
+		return mot2.slice(0..n2-1)
+	end
+	def first_word(mot3, n3)
+		return mot3.scan(/\w+/)[0]
+	end
+	def titleize(mot2)
+		
+	end
+end
\ No newline at end of file
diff --git a/lib/05_timer.rb b/lib/05_timer.rb
new file mode 100644
index 00000000..a7bb8824
--- /dev/null
+++ b/lib/05_timer.rb
@@ -0,0 +1,59 @@
+def time_string(s)
+	min = 0
+	h = 0
+	if s < 60
+		if s < 10
+			return "0#{h}:0#{min}:0#{s}"
+		else
+			return "0#{h}:0#{min}:#{s}"
+		end
+	else
+		while s >= 60
+			s -= 60
+			min += 1
+		end
+		if min < 60
+			if min < 10 && s < 10
+				return "0#{h}:0#{min}:0#{s}"
+			end
+			if min >= 10 && s < 10
+				return "0#{h}:#{min}:0#{s}"
+			end
+			if min < 10 && s >= 10
+				return "0#{h}:0#{min}:#{s}"
+			end
+			if min >= 10 && s >= 10
+				return "0#{h}:#{min}:#{s}"
+			end
+		else
+			while min >= 60
+				min -= 60
+				h += 1
+			end
+			if h < 10 && min < 10 && s < 10
+				return "0#{h}:0#{min}:0#{s}"
+			end
+			if h < 10 && min < 10 && s >= 10
+				return "0#{h}:0#{min}:#{s}"
+			end
+			if h < 10 && min >= 10 && s < 10
+				return "0#{h}:#{min}:0#{s}"
+			end
+			if h < 10 && min >= 10 && s >= 10
+				return "0#{h}:#{min}:#{s}"
+			end
+			if h >= 10 && min < 10 && s < 10
+				return "#{h}:0#{min}:0#{s}"
+			end
+			if h >= 10 && min < 10 && s >= 10
+				return "#{h}:0#{min}:#{s}"
+			end
+			if h >= 10 && min >= 10 && s < 10
+				return "#{h}:#{min}:0#{s}"
+			end
+			if h >= 10 && min >= 10 && s >= 10
+				return "#{h}:#{min}:#{s}"
+			end
+		end
+	end
+end
\ No newline at end of file
diff --git a/lib/06_pig_latin.rb b/lib/06_pig_latin.rb
new file mode 100644
index 00000000..63fbb0d1
--- /dev/null
+++ b/lib/06_pig_latin.rb
@@ -0,0 +1,12 @@
+def translate(mot)
+	k = mot[0]
+	if k=="a" || k=="e" || k=="o" || k=="i" || k=="u" || k== "y" 
+		return mot+"ay"
+	else
+		return mot.reverse+"ay"
+	end
+	aa = mot.slice(0..1)
+	if aa=="ch"
+		return mot.reverse(2..mot.length-1)+mot(0..1)
+	end
+end
\ No newline at end of file