The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
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Speaking to Matt Chorley on BBC 5 Live on Thursday, Milburn dismissed the idea that there was a "snowflake" generation who were reluctant to work or less resilient than previous generations.
Mr Duffy's comments about the potential for China and Russia to potentially "declare a keep-out zone" on the Moon appear to be referring to an agreement called the Artemis accords.
第五十九条 涉及军工、军事等国防领域的原子能研究、开发和利用活动的管理办法，由国务院、中央军事委员会依据本法规定的原则另行制定。