Mental retardation affects approximately 3% of the population, and the background birth defect rate is 3% to 4%. An underlying cause is identified less than 50% of the time. In the cases in which a ...

Multiply by 0, 1, and 10 using the grouping of objects, counting by tens, and arrays. Explore the Multiply by 10 facts using the grouping of objects, counting by tens, and arrays. Practice with the ...

We previously developed a framework for creating random tilings with both unbounded and finite DNA origami arrays 18. The finite arrays were assembled in two stages and had four-fold rotational ...