The human brain continues to mature until about what age?

Yes

Explanation:

Step 1: How to clean and degrease animal bones

Fill a bowl with water and dish soap and use an old toothbrush to gently scrub and clean your bones. The cleaner the better. If you're cleaning a skull, small teeth may fall out in the process. Just hang onto them and glue them back on at the end once everything is dry.

Wash bones in soapy water and set aside.

Fill plastic container with enough peroxide (1-part) and water (10-parts) to submerge one bone at a time.

Stir until well mixed.  

Soak bone for 2 to 5 minutes: the greasier the bone, the longer you soak.

Gently brush entire bone surface with toothbrush.

Hope this helped!!!