Toys for 3 year olds: your questions answered

Three is a wonderful age for building, counting and making believe. These hands-on toys grow with your preschooler.

What are the best educational toys for 3 year olds?
Which active toys suit 3 year olds?
How can I support early maths at age 3?
How can I support early letters at age 3?
What building toys suit 3 year olds?
What are good Christmas gifts for 3 year olds?