[Avodah] 2 unrelated questions

[Rich, Joel]

1. Anyone know of a source for the custom of a muzinka(sp?) - the dance
when a last child is married off?

2. The gemara in horiyot 2b describes ben zoma as a talmid raui lhoraah.
The commentaries discuss why he never got smicha even though there was
none like him in torah. The beer sheva says it's because he died young..
Is anyone aware of a source that someone would not be eligible for
smicha, even thought he was gamir vsavir (knows and can use logic to
apply) simply due to age?  If so, how did "harei ani kben shivim shanah"
work for an 18 year old?

KT
Joel Rich
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