diff --git a/ch10/extract_fn b/ch10/extract_fn
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index 0000000..847d90d
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diff --git a/ch10/extract_fn.rs b/ch10/extract_fn.rs
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--- /dev/null
+++ b/ch10/extract_fn.rs
@@ -0,0 +1,21 @@
+fn largest(list: &[i32]) -> &i32 {
+    let mut largest = &list[0];
+
+    for num in list {
+        if num > largest {
+            largest = num;
+        }
+    }
+
+    largest
+}
+
+fn main() {
+    let number_list = vec![30, 52, 12, 69, 23, 50];
+    let large = largest(&number_list);
+    println!("Largest: {large}");
+
+    let number_list = vec![130, 52, 12, 69, 23, 50];
+    let large = largest(&number_list);
+    println!("Largest: {large}");
+}
diff --git a/ch10/lifetime_hypotheses b/ch10/lifetime_hypotheses
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diff --git a/ch10/lifetime_hypotheses.rs b/ch10/lifetime_hypotheses.rs
new file mode 100644
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--- /dev/null
+++ b/ch10/lifetime_hypotheses.rs
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+use std::io;
+
+fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+    if x.len() > y.len() { x } else { y }    
+}
+
+fn brap<'b>(x: &'b str, y: &str) -> &'b str {
+    if x.len() > y.len() { x } else { "henkieeeeee" }
+}
+
+fn main() {
+    let stronk = String::from("stronkman");
+
+    let ln;
+    {
+        let stonks = "stonks";
+        let mut inp = String::new();
+        io::stdin().read_line(&mut inp).expect("Please input a name");
+        ln = longest(&inp, brap(stronk.as_str(), stonks));
+    }
+    println!("The longest of them all: {}", ln);
+}
diff --git a/ch10/trait_blanket_implementation b/ch10/trait_blanket_implementation
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diff --git a/ch10/trait_blanket_implementation.rs b/ch10/trait_blanket_implementation.rs
new file mode 100644
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+++ b/ch10/trait_blanket_implementation.rs
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+trait Named {
+    fn say_name(&self) -> String;
+}
+
+trait Bold {
+    fn write_bold(&self);
+}
+
+impl<T: Named> Bold for T {
+    fn write_bold(&self) {
+        println!("!bold {}", self.say_name())
+    }
+}
+
+struct Person {
+    name: String,
+}
+
+impl Named for Person {
+    fn say_name(&self) -> String {
+        self.name.clone()
+    }
+}
+
+fn main() {
+    let p = Person{name: String::from("Jasper")};
+
+    p.write_bold();
+}