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                            [slug] => microsoft-excel
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            [subcategories] => Array
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                            [slug] => geometry
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                            [slug] => prealgebra
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                            [slug] => statistics
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            [parent_category] => Array
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                    [slug] => science
                    [name] => Science
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            [subcategories] => Array
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                            [slug] => biology
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                    [1] => Array
                        (
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                            [slug] => chemistry
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                        (
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                            [slug] => ecology
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                            [slug] => elementary-science
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