关于JavaScript原型继承的小小疑惑

Question

//定义一个book对象
var Book = function(title, publisher) {
    this.title = title;
    this.publisher = publisher;
};
//于是在原型对象中增加一个sayTitle()方法，用来显示书名
Book.prototype.sayTitle = function() {
    alert(this.title);
};
//实例化对象
var book1 = new Book("High Performance JavaScript", "Yahoo Press");
//输出"High Performance JavaScript"
book1.sayTitle();

//又定义了一个对象
var people = function(age,name,title){
  this.age = age;
  this.name = name;
  this.title = title;
};
var p = new people(25,"William","Programmer");    //实例化
p.sayTitle();  //报错：Uncaught TypeError: p.sayTitle is not a function

疑惑：book的原型指向的是Object，通过prototype新加的sayTitle()方法应该是加到Object对象上啊，为什么新的people对象不能用sayTitle()方法？

Answer 1

console.log(Book.prototype === Object);
console.log(Book.prototype === Object.prototype);

你自己运行看看结果是什么喽。

---

类的原型和Object到底啥关系？

console.log(Book.prototype instanceof Object);

你再运行这段代码看看结果。

Answer 2

对象得需要继承才能有父的方法，book和people是不同的类，且没有任何继承，怎么会有关联呢？
就好比，人能哺乳，而鸟怎么能哺乳呢？

Answer 3

book的原型指向的是Object

这句话从何而来？