I have a dictionary that contains a key and a list of values. I want to make a simple pandas df, however, I am having trouble breaking out the list items into separate rows. My current approach creates a df but keeps the values in a list. How can I pull them out and add them as separate rows?

```
d = {'Car':['1','2','3'],
     'Chicken legs':['4','5','6'],
     'Coronary artery bypass graft surgery':['7','8','9','10','11','12']}

df = pd.DataFrame({'Thing':list(d.keys()), 'Values':list(d.values())})

    Thing                                   Values
0   Car                                     [1, 2, 3]
1   Chicken_legs                            [4, 5, 6]
2   Coronary artery bypass graft surgery    [7, 8, 9, 10, 11, 12]

```

Anticipated end result:

```
     Thing                                  Values
0  Car                                      1
1  Car                                      2
2  Car                                      3
3  Chicken_legs                             4
4  Chicken_legs                             5
5  Chicken_legs                             6
6  Coronary artery bypass graft surgery     7
7  Coronary artery bypass graft surgery     8
8  Coronary artery bypass graft surgery     9
9  Coronary artery bypass graft surgery     10
10 Coronary artery bypass graft surgery     11
11 Coronary artery bypass graft surgery     12

```