1
00:00:05,930 --> 00:00:03,470
so the three pieces of data we have are

2
00:00:07,309 --> 00:00:05,940
the date on the clock that is now 14

3
00:00:08,270 --> 00:00:07,319
billion years since the beginning of the

4
00:00:10,310 --> 00:00:08,280
universe

5
00:00:11,930 --> 00:00:10,320
there's the piece of data that at the

6
00:00:13,789 --> 00:00:11,940
moment we don't see anything in the sky

7
00:00:15,470 --> 00:00:13,799
that's data

8
00:00:17,930 --> 00:00:15,480
and the third piece of data is when we

9
00:00:19,730 --> 00:00:17,940
look at the history of life on Earth we

10
00:00:22,070 --> 00:00:19,740
can see certain key events happened at

11
00:00:24,830 --> 00:00:22,080
certain dates and that gives us a key

12
00:00:26,630 --> 00:00:24,840
clue to basically how many hard steps

13
00:00:28,609 --> 00:00:26,640
life had to go through to get to where

14
00:00:31,310 --> 00:00:28,619
we are and that's another key parameter

15
00:00:33,350 --> 00:00:31,320
so with those three parameters each one

16
00:00:35,870 --> 00:00:33,360
of them tells us about one of the three

17
00:00:37,910 --> 00:00:35,880
parameters in this three parameter model