<human>:  How do I build shelves without using nails or screws?
<bot>: You can build shelves without using nails or screws by using adhesive such as glue, epoxy, or construction adhesive to join the pieces together. You can also use dowels or slots to join the pieces together. Additionally, you can use metal brackets, metal clips, or L-brackets to provide additional support to the shelf without the need for nails or screws.